organic compounds
4-Chlorobenzoyl-meso-octamethylcalix[2]pyrrolidino[2]pyrrole: an acyl chloride derivative of a partially reduced calix[4] pyrrole
aInstitute of Chemistry, University of Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland, and bInstitute of Physics, University of Neuchâtel, Rue Emile-Argand 11, CH-2000 Neuchâtel, Switzerland
*Correspondence e-mail: reinhard.neier@unine.ch, helen.stoeckli-evans@unine.ch
In the title compound, C35H47ClN4O, the two pyrrolidine rings have envelope conformations. The conformation of the macrocycle is stabilized by N—H⋯N hydrogen bonds and a C—H⋯N interaction. The benzoyl ring is inclined to the adjacent pyrrole ring by 11.66 (11)°, with a centroid–centroid distance of 3.7488 (13) Å. In the crystal, molecules are linked by N—H⋯O hydrogen bonds into helical chains propagating in [010] and C—H⋯O and C—H⋯π interactions are also observed.
Related literature
For the heterogeneous catalytic hydrogenation of meso-octamethylcalix[4]pyrrole, which gave meso-octamethylcalix[2]pyrrole[2]pyrrolidine, see: Blangy et al. (2009). For N-acylation of pyrrolidines, using substituted benzoyl chlorides, see: Journot et al. (2012a); Zhang et al. (2009). For the synthesis and reactivity of the title compound, see: Journot & Neier (2012). For the crystal structures of similar compounds, see: Journot et al. (2012b,c,d,e).
Experimental
Crystal data
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Refinement
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Data collection: X-AREA (Stoe & Cie, 2009); cell X-AREA; data reduction: X-RED32 (Stoe & Cie, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97, PLATON and publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536812007003/zq2154sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812007003/zq2154Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812007003/zq2154Isup3.cml
The general procedure for the N-acylation of meso-octamethylcalix[2]pyrrolidino[2]pyrrole (1) is illustrated in Fig. 3. A two-necked flask fitted with a gas inlet and containing a stirrer bar was charged with 100 mg (0.23 mmol) of meso-octamethylcalix[2]pyrrolidino[2]pyrrole (1), 4-chlorobenzoyl chloride (2c) (53.61 µL, 0.48 mmol), potassium carbonate (70 mg, 0.48 mmol) in THF (5 ml) and acetonitrile (2.5 ml). The reaction vessel was flushed with argon and sealed with a septum. After 15 min. a precipitate appeared and the reaction mixture was stirred for 2 h room temperature. 10% sodium carbonate was then added and the reaction mixture was extracted with dichloromethane. The organic layer was washed successively with two × 10% sodium carbonate and saturated brine. The organic layer was dried with sodium sulfate, and the solvents were removed under vacuum. The residue was purified by
(SiO2, CH2Cl2/MeOH, 97/3) to yield 131.6 mg (75.6%) of colourless crystals of the title compound (3c). Melting point: 501 K. HRMS calcd. for C35H47ClN4O+H+ 575.3511; found 575.3510. Further synthetic and spectroscopic data have been reported elsewhere (Journot & Neier, 2012).The NH H-atoms were located in a difference electron-density map. H-atom H3N was freely refined while the other NH H-atoms and the C-bound H-atoms were included in calculated positions and treated as riding atoms: N—H = 0.88 Å, C—H = 0.95 Å for CH-allyl and CH-aromatic H atoms, and 1.00, 0.99 and 0.98 Å, for methine, methylene and methyl H atoms, respectively, with Uiso(H) = k × Ueq(N,C), where k = 1.5 for CH3 H-atoms, and 1.2 for the other H-atoms.
We have recently reported the access to new macrocycles by heterogeneous catalytic hydrogenation of meso-octamethylcalix[4]pyrrole, which gave meso-octamethylcalix[2]pyrrole[2]pyrrolidine (1 in Fig. 3) [Blangy et al., 2009]. It was decided to investigate the nucleophilicity of this new macrocycle, which showed interesting reactivity (Journot & Neier, 2012), by reacting different substituted benzoyl chlorides with the macrocycle under smooth conditions [Journot et al., 2012a; Zhang et al., 2009]. Herein, we report on the synthesis and
of the title 4-chlorobenzoyl derivative, one of five compounds that have been studied by X-ray (Journot et al., 2012b,c,d,e).The molecular structure of the title compound is given in Fig. 1. The two pyrrolidine rings (N1,C1,C12—C14) and (N3,C6,C7,C21,C22) have envelope conformations with, respectively, atoms C13 and C6 as the flaps. The conformation of the macrocycle is stabilized by intramolecular N—H···N hydrogen bonds involving atom N3 and the two pyrrole H atoms, H2 and H4 (Fig. 1 and Table 1). The benzoyl ring (C30—C35) is inclined to the pyrrole ring (N4,C9,C10,C17,C18) by 11.66 (11)°, with a centroid-to-centroid distance of 3.7488 (13) Å. The methyl group C15 is also in close contact with the pyrrole ring (N2,C3,C4,C25,C26), with a short C15—H15A···N2 interaction and a C15—H15A···centroid distance of 3.301 (2) [see Table 1].
In the crystal, molecules are linked via an N—H···O hydrogen bond, involving the N3 pyrrolidine H-atom (H3N) and the benzoyl O atom (O1), leading to the formation of helical chains propagating along [010] - see Fig. 2 and Table 1. The same O atom is involved in a C—H···O contact with methyl group C23. A C—H···π interaction is also observed, involving the methyl group C27 and the benzoyl ring (C30—C35) [see Table 1].
The overall geometry and crystal packing is very similar to that reported for the 4-methoxybenzoyl derivative (Journot et al., 2012b), and the 4-nitrobenzoyl (Journot et al., 2012d) and 4-methylbenzoyl (Journot et al., 2012e) derivatives. The benzoyl derivative (Journot et al., 2012c) crystallized, in the trigonal
R-3, as a partial (0.25H2O) hydrate, and forms hydrogen bonded chains propagating along [001].Footnote to Table 1: Cg1 is the centroid of pyrrole ring (N2,C3,C4,C25,C26); Cg2 is the centroid of the benzene ring (C30—C35).
For the heterogeneous catalytic hydrogenation of meso-octamethylcalix[4]pyrrole, which gave meso-octamethylcalix[2]pyrrole[2]pyrrolidine, see: Blangy et al. (2009). For N-acylation of pyrrolidines, using substituted benzoyl chlorides, see: Journot et al. (2012a); Zhang et al. (2009). For the synthesis and reactivity of the title compound, see: Journot & Neier (2012). For the crystal structures of similar compounds, see: Journot et al. (2012b,c,d,e)
Data collection: X-AREA (Stoe & Cie, 2009); cell
X-AREA (Stoe & Cie, 2009); data reduction: X-RED32 (Stoe & Cie, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).Fig. 1. A view of the molecular structure of the title compound, with the numbering scheme and displacement ellipsoids drawn at the 50% probability level. The N—H···N hydrogen bonds are shown as dashed lines (see Table 1 for details; the C-bound H atoms have been omitted for clarity). | |
Fig. 2. A view along the a axis of the crystal packing of the title compound. The N—H···N and N—H···O hydrogen bonds are shown as dashed lines (see Table 1 for details; the C-bound H atoms have been omitted for clarity). | |
Fig. 3. The general procedure for the N-acylation of meso-octamethylcalix[2]pyrrolidino[2]pyrrole (1). |
C35H47ClN4O | F(000) = 1240 |
Mr = 575.22 | Dx = 1.222 Mg m−3 |
Monoclinic, P21/n | Melting point: 501 K |
Hall symbol: -P 2yn | Mo Kα radiation, λ = 0.71073 Å |
a = 10.3224 (6) Å | Cell parameters from 16706 reflections |
b = 12.0389 (4) Å | θ = 1.6–26.1° |
c = 25.3311 (13) Å | µ = 0.16 mm−1 |
β = 96.798 (4)° | T = 173 K |
V = 3125.8 (3) Å3 | Block, colourless |
Z = 4 | 0.45 × 0.42 × 0.40 mm |
Stoe IPDS 2 diffractometer | 5906 independent reflections |
Radiation source: fine-focus sealed tube | 4215 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.076 |
φ + ω scans | θmax = 25.6°, θmin = 1.6° |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | h = −12→12 |
Tmin = 0.973, Tmax = 1.000 | k = −14→14 |
32665 measured reflections | l = −30→30 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.102 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0461P)2 + 0.1416P] where P = (Fo2 + 2Fc2)/3 |
5906 reflections | (Δ/σ)max < 0.001 |
381 parameters | Δρmax = 0.24 e Å−3 |
1 restraint | Δρmin = −0.34 e Å−3 |
C35H47ClN4O | V = 3125.8 (3) Å3 |
Mr = 575.22 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 10.3224 (6) Å | µ = 0.16 mm−1 |
b = 12.0389 (4) Å | T = 173 K |
c = 25.3311 (13) Å | 0.45 × 0.42 × 0.40 mm |
β = 96.798 (4)° |
Stoe IPDS 2 diffractometer | 5906 independent reflections |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | 4215 reflections with I > 2σ(I) |
Tmin = 0.973, Tmax = 1.000 | Rint = 0.076 |
32665 measured reflections |
R[F2 > 2σ(F2)] = 0.053 | 1 restraint |
wR(F2) = 0.102 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.24 e Å−3 |
5906 reflections | Δρmin = −0.34 e Å−3 |
381 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Cl1 | 1.05031 (7) | 0.59602 (6) | 0.05700 (3) | 0.0518 (3) | |
O1 | 0.69721 (14) | 0.42893 (12) | 0.23989 (6) | 0.0285 (5) | |
N1 | 0.54054 (15) | 0.36573 (13) | 0.17599 (6) | 0.0190 (5) | |
N2 | 0.49236 (15) | 0.04698 (13) | 0.19441 (6) | 0.0190 (5) | |
N3 | 0.69523 (16) | −0.04818 (14) | 0.14086 (7) | 0.0205 (5) | |
N4 | 0.65525 (16) | 0.18840 (13) | 0.09895 (6) | 0.0196 (5) | |
C1 | 0.45318 (19) | 0.34058 (16) | 0.21789 (8) | 0.0211 (6) | |
C2 | 0.47134 (19) | 0.22457 (16) | 0.24667 (8) | 0.0211 (6) | |
C3 | 0.41422 (19) | 0.12539 (16) | 0.21499 (8) | 0.0201 (6) | |
C4 | 0.41809 (19) | −0.03545 (16) | 0.16818 (8) | 0.0208 (6) | |
C5 | 0.4779 (2) | −0.14266 (16) | 0.15089 (8) | 0.0223 (6) | |
C6 | 0.59425 (19) | −0.12726 (16) | 0.11840 (8) | 0.0225 (6) | |
C7 | 0.7886 (2) | −0.03802 (17) | 0.10096 (8) | 0.0224 (6) | |
C8 | 0.86281 (19) | 0.07432 (17) | 0.10394 (8) | 0.0233 (6) | |
C9 | 0.77456 (19) | 0.16747 (16) | 0.08152 (8) | 0.0211 (6) | |
C10 | 0.59096 (19) | 0.27254 (16) | 0.06975 (8) | 0.0204 (6) | |
C11 | 0.45514 (19) | 0.31136 (16) | 0.07862 (8) | 0.0212 (6) | |
C12 | 0.46446 (19) | 0.39816 (16) | 0.12436 (8) | 0.0219 (6) | |
C13 | 0.3355 (2) | 0.43797 (17) | 0.14288 (9) | 0.0275 (7) | |
C14 | 0.3152 (2) | 0.36450 (17) | 0.19048 (9) | 0.0255 (7) | |
C15 | 0.3680 (2) | 0.21172 (17) | 0.08691 (9) | 0.0252 (7) | |
C16 | 0.3952 (2) | 0.37268 (18) | 0.02826 (9) | 0.0291 (7) | |
C17 | 0.6724 (2) | 0.30665 (17) | 0.03383 (9) | 0.0270 (7) | |
C18 | 0.7864 (2) | 0.24086 (18) | 0.04111 (9) | 0.0279 (7) | |
C19 | 0.9189 (2) | 0.09679 (19) | 0.16166 (9) | 0.0278 (7) | |
C20 | 0.9764 (2) | 0.0633 (2) | 0.07007 (10) | 0.0352 (8) | |
C21 | 0.7047 (2) | −0.06059 (18) | 0.04720 (8) | 0.0274 (7) | |
C22 | 0.5666 (2) | −0.08356 (18) | 0.06159 (8) | 0.0259 (7) | |
C23 | 0.5242 (2) | −0.20936 (17) | 0.20181 (9) | 0.0278 (7) | |
C24 | 0.3731 (2) | −0.21047 (18) | 0.11673 (9) | 0.0304 (7) | |
C25 | 0.2906 (2) | −0.00910 (17) | 0.17232 (9) | 0.0255 (7) | |
C26 | 0.2880 (2) | 0.09026 (17) | 0.20192 (9) | 0.0257 (7) | |
C27 | 0.6151 (2) | 0.20230 (17) | 0.26588 (9) | 0.0257 (7) | |
C28 | 0.3973 (2) | 0.23431 (19) | 0.29592 (9) | 0.0323 (8) | |
C29 | 0.65598 (19) | 0.41796 (16) | 0.19249 (8) | 0.0209 (6) | |
C30 | 0.74298 (19) | 0.45928 (16) | 0.15280 (8) | 0.0210 (6) | |
C31 | 0.8608 (2) | 0.40440 (18) | 0.15117 (9) | 0.0279 (7) | |
C32 | 0.9543 (2) | 0.44442 (19) | 0.12113 (10) | 0.0336 (7) | |
C33 | 0.9312 (2) | 0.54209 (19) | 0.09329 (9) | 0.0312 (7) | |
C34 | 0.8160 (2) | 0.59963 (18) | 0.09487 (9) | 0.0289 (7) | |
C35 | 0.7220 (2) | 0.55801 (16) | 0.12428 (8) | 0.0247 (7) | |
H1 | 0.47190 | 0.39840 | 0.24610 | 0.0250* | |
H2 | 0.57810 | 0.04950 | 0.19770 | 0.0230* | |
H3N | 0.7345 (19) | −0.0690 (17) | 0.1721 (7) | 0.0250* | |
H4 | 0.62440 | 0.15290 | 0.12510 | 0.0230* | |
H6 | 0.63730 | −0.20130 | 0.11650 | 0.0270* | |
H7 | 0.85420 | −0.09910 | 0.10740 | 0.0270* | |
H12 | 0.50810 | 0.46530 | 0.11140 | 0.0260* | |
H13A | 0.34150 | 0.51710 | 0.15350 | 0.0330* | |
H13B | 0.26240 | 0.42900 | 0.11410 | 0.0330* | |
H14A | 0.27030 | 0.29460 | 0.17860 | 0.0310* | |
H14B | 0.26260 | 0.40360 | 0.21490 | 0.0310* | |
H15A | 0.40200 | 0.17280 | 0.11960 | 0.0380* | |
H15B | 0.36690 | 0.16100 | 0.05660 | 0.0380* | |
H15C | 0.27900 | 0.23750 | 0.08980 | 0.0380* | |
H16A | 0.39670 | 0.32400 | −0.00270 | 0.0440* | |
H16B | 0.44580 | 0.44000 | 0.02340 | 0.0440* | |
H16C | 0.30480 | 0.39310 | 0.03200 | 0.0440* | |
H17 | 0.65510 | 0.36450 | 0.00850 | 0.0320* | |
H18 | 0.85890 | 0.24660 | 0.02140 | 0.0330* | |
H19A | 0.96960 | 0.03230 | 0.17580 | 0.0420* | |
H19B | 0.84730 | 0.11020 | 0.18310 | 0.0420* | |
H19C | 0.97560 | 0.16230 | 0.16310 | 0.0420* | |
H20A | 0.94180 | 0.04710 | 0.03320 | 0.0530* | |
H20B | 1.03400 | 0.00270 | 0.08400 | 0.0530* | |
H20C | 1.02580 | 0.13290 | 0.07150 | 0.0530* | |
H21A | 0.70470 | 0.00480 | 0.02350 | 0.0330* | |
H21B | 0.73840 | −0.12560 | 0.02920 | 0.0330* | |
H22A | 0.51370 | −0.01480 | 0.06010 | 0.0310* | |
H22B | 0.52110 | −0.13980 | 0.03760 | 0.0310* | |
H23A | 0.45140 | −0.21860 | 0.22300 | 0.0420* | |
H23B | 0.59530 | −0.16920 | 0.22280 | 0.0420* | |
H23C | 0.55540 | −0.28250 | 0.19200 | 0.0420* | |
H24A | 0.33490 | −0.16520 | 0.08670 | 0.0450* | |
H24B | 0.30480 | −0.23240 | 0.13840 | 0.0450* | |
H24C | 0.41300 | −0.27700 | 0.10330 | 0.0450* | |
H25 | 0.21650 | −0.05050 | 0.15780 | 0.0310* | |
H26 | 0.21210 | 0.12650 | 0.21120 | 0.0310* | |
H27A | 0.64820 | 0.26010 | 0.29120 | 0.0380* | |
H27B | 0.66550 | 0.20300 | 0.23540 | 0.0380* | |
H27C | 0.62380 | 0.12960 | 0.28330 | 0.0380* | |
H28A | 0.43610 | 0.29370 | 0.31910 | 0.0480* | |
H28B | 0.30550 | 0.25160 | 0.28460 | 0.0480* | |
H28C | 0.40330 | 0.16380 | 0.31540 | 0.0480* | |
H31 | 0.87760 | 0.33800 | 0.17110 | 0.0330* | |
H32 | 1.03350 | 0.40500 | 0.11970 | 0.0400* | |
H34 | 0.80130 | 0.66740 | 0.07590 | 0.0350* | |
H35 | 0.64230 | 0.59720 | 0.12500 | 0.0300* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0417 (4) | 0.0663 (5) | 0.0499 (4) | −0.0137 (3) | 0.0153 (3) | 0.0165 (4) |
O1 | 0.0300 (8) | 0.0350 (9) | 0.0190 (8) | −0.0049 (7) | −0.0032 (6) | −0.0026 (7) |
N1 | 0.0205 (9) | 0.0188 (8) | 0.0168 (9) | 0.0017 (7) | −0.0012 (7) | 0.0010 (7) |
N2 | 0.0145 (8) | 0.0212 (8) | 0.0213 (9) | −0.0005 (7) | 0.0023 (7) | 0.0011 (7) |
N3 | 0.0221 (9) | 0.0238 (9) | 0.0150 (9) | 0.0003 (7) | −0.0004 (7) | 0.0019 (7) |
N4 | 0.0221 (9) | 0.0218 (9) | 0.0147 (9) | −0.0017 (7) | 0.0019 (7) | 0.0051 (7) |
C1 | 0.0199 (10) | 0.0219 (10) | 0.0217 (11) | 0.0029 (8) | 0.0035 (8) | −0.0018 (9) |
C2 | 0.0223 (10) | 0.0223 (10) | 0.0191 (11) | 0.0030 (8) | 0.0039 (8) | −0.0001 (9) |
C3 | 0.0211 (10) | 0.0215 (10) | 0.0183 (11) | 0.0031 (8) | 0.0046 (8) | 0.0051 (8) |
C4 | 0.0221 (11) | 0.0219 (10) | 0.0180 (11) | −0.0027 (8) | 0.0010 (8) | 0.0045 (9) |
C5 | 0.0267 (11) | 0.0180 (10) | 0.0218 (11) | −0.0041 (8) | 0.0012 (9) | −0.0005 (9) |
C6 | 0.0254 (11) | 0.0178 (10) | 0.0237 (12) | 0.0016 (8) | 0.0002 (9) | −0.0022 (9) |
C7 | 0.0237 (11) | 0.0229 (10) | 0.0211 (11) | 0.0056 (9) | 0.0050 (9) | −0.0009 (9) |
C8 | 0.0196 (10) | 0.0283 (11) | 0.0223 (11) | 0.0005 (9) | 0.0039 (8) | 0.0011 (9) |
C9 | 0.0203 (10) | 0.0230 (10) | 0.0202 (11) | −0.0035 (8) | 0.0029 (8) | −0.0005 (9) |
C10 | 0.0240 (11) | 0.0196 (10) | 0.0163 (11) | −0.0036 (8) | −0.0024 (8) | 0.0000 (8) |
C11 | 0.0219 (11) | 0.0226 (10) | 0.0177 (11) | −0.0021 (8) | −0.0034 (8) | 0.0032 (9) |
C12 | 0.0229 (11) | 0.0190 (10) | 0.0223 (11) | 0.0000 (8) | −0.0038 (8) | 0.0051 (9) |
C13 | 0.0247 (11) | 0.0231 (11) | 0.0340 (13) | 0.0049 (9) | 0.0001 (9) | 0.0020 (10) |
C14 | 0.0240 (11) | 0.0245 (11) | 0.0283 (12) | 0.0065 (9) | 0.0048 (9) | 0.0025 (9) |
C15 | 0.0237 (11) | 0.0263 (11) | 0.0240 (12) | −0.0035 (9) | −0.0033 (9) | 0.0011 (9) |
C16 | 0.0293 (12) | 0.0318 (12) | 0.0243 (12) | 0.0007 (10) | −0.0048 (9) | 0.0064 (10) |
C17 | 0.0330 (12) | 0.0270 (12) | 0.0207 (11) | −0.0028 (9) | 0.0021 (9) | 0.0059 (9) |
C18 | 0.0290 (12) | 0.0335 (12) | 0.0224 (12) | −0.0042 (10) | 0.0087 (9) | 0.0031 (10) |
C19 | 0.0218 (11) | 0.0307 (12) | 0.0297 (13) | 0.0003 (9) | −0.0017 (9) | 0.0026 (10) |
C20 | 0.0263 (12) | 0.0431 (14) | 0.0379 (14) | 0.0040 (10) | 0.0105 (10) | 0.0044 (11) |
C21 | 0.0325 (12) | 0.0279 (12) | 0.0216 (12) | −0.0034 (9) | 0.0030 (9) | −0.0039 (9) |
C22 | 0.0295 (12) | 0.0254 (11) | 0.0220 (12) | −0.0016 (9) | −0.0005 (9) | −0.0029 (9) |
C23 | 0.0314 (12) | 0.0230 (11) | 0.0295 (13) | 0.0012 (9) | 0.0052 (10) | 0.0036 (10) |
C24 | 0.0311 (12) | 0.0295 (11) | 0.0306 (13) | −0.0083 (10) | 0.0043 (10) | −0.0036 (10) |
C25 | 0.0200 (11) | 0.0250 (11) | 0.0305 (13) | −0.0047 (9) | −0.0015 (9) | 0.0072 (10) |
C26 | 0.0203 (11) | 0.0252 (11) | 0.0322 (13) | 0.0024 (9) | 0.0062 (9) | 0.0067 (10) |
C27 | 0.0289 (12) | 0.0209 (10) | 0.0252 (12) | 0.0027 (9) | −0.0050 (9) | −0.0001 (9) |
C28 | 0.0420 (14) | 0.0317 (12) | 0.0249 (13) | 0.0069 (10) | 0.0107 (10) | 0.0024 (10) |
C29 | 0.0238 (11) | 0.0158 (10) | 0.0222 (12) | 0.0029 (8) | −0.0006 (9) | −0.0015 (9) |
C30 | 0.0225 (11) | 0.0204 (10) | 0.0187 (11) | −0.0049 (8) | −0.0037 (8) | −0.0045 (9) |
C31 | 0.0240 (11) | 0.0252 (11) | 0.0336 (13) | 0.0000 (9) | −0.0003 (9) | 0.0033 (10) |
C32 | 0.0233 (11) | 0.0354 (13) | 0.0422 (14) | 0.0033 (10) | 0.0038 (10) | 0.0017 (11) |
C33 | 0.0285 (12) | 0.0400 (13) | 0.0252 (12) | −0.0121 (10) | 0.0042 (9) | 0.0000 (11) |
C34 | 0.0347 (13) | 0.0263 (11) | 0.0235 (12) | −0.0074 (10) | −0.0058 (9) | 0.0037 (10) |
C35 | 0.0257 (11) | 0.0217 (11) | 0.0251 (12) | 0.0006 (9) | −0.0035 (9) | −0.0015 (9) |
Cl1—C33 | 1.745 (2) | C33—C34 | 1.381 (3) |
O1—C29 | 1.233 (3) | C34—C35 | 1.385 (3) |
N1—C1 | 1.503 (3) | C1—H1 | 1.0000 |
N1—C12 | 1.496 (3) | C6—H6 | 1.0000 |
N1—C29 | 1.368 (3) | C7—H7 | 1.0000 |
N2—C3 | 1.383 (3) | C12—H12 | 1.0000 |
N2—C4 | 1.376 (2) | C13—H13A | 0.9900 |
N3—C6 | 1.475 (3) | C13—H13B | 0.9900 |
N3—C7 | 1.482 (3) | C14—H14A | 0.9900 |
N4—C9 | 1.380 (3) | C14—H14B | 0.9900 |
N4—C10 | 1.378 (3) | C15—H15A | 0.9800 |
N2—H2 | 0.8800 | C15—H15B | 0.9800 |
N3—H3N | 0.882 (18) | C15—H15C | 0.9800 |
N4—H4 | 0.8800 | C16—H16A | 0.9800 |
C1—C2 | 1.576 (3) | C16—H16B | 0.9800 |
C1—C14 | 1.536 (3) | C16—H16C | 0.9800 |
C2—C3 | 1.518 (3) | C17—H17 | 0.9500 |
C2—C27 | 1.530 (3) | C18—H18 | 0.9500 |
C2—C28 | 1.543 (3) | C19—H19A | 0.9800 |
C3—C26 | 1.373 (3) | C19—H19B | 0.9800 |
C4—C5 | 1.518 (3) | C19—H19C | 0.9800 |
C4—C25 | 1.370 (3) | C20—H20A | 0.9800 |
C5—C23 | 1.546 (3) | C20—H20B | 0.9800 |
C5—C6 | 1.545 (3) | C20—H20C | 0.9800 |
C5—C24 | 1.538 (3) | C21—H21A | 0.9900 |
C6—C22 | 1.527 (3) | C21—H21B | 0.9900 |
C7—C8 | 1.552 (3) | C22—H22A | 0.9900 |
C7—C21 | 1.549 (3) | C22—H22B | 0.9900 |
C8—C20 | 1.538 (3) | C23—H23A | 0.9800 |
C8—C9 | 1.512 (3) | C23—H23B | 0.9800 |
C8—C19 | 1.532 (3) | C23—H23C | 0.9800 |
C9—C18 | 1.369 (3) | C24—H24A | 0.9800 |
C10—C11 | 1.520 (3) | C24—H24B | 0.9800 |
C10—C17 | 1.373 (3) | C24—H24C | 0.9800 |
C11—C16 | 1.539 (3) | C25—H25 | 0.9500 |
C11—C12 | 1.555 (3) | C26—H26 | 0.9500 |
C11—C15 | 1.529 (3) | C27—H27A | 0.9800 |
C12—C13 | 1.539 (3) | C27—H27B | 0.9800 |
C13—C14 | 1.530 (3) | C27—H27C | 0.9800 |
C17—C18 | 1.412 (3) | C28—H28A | 0.9800 |
C21—C22 | 1.538 (3) | C28—H28B | 0.9800 |
C25—C26 | 1.414 (3) | C28—H28C | 0.9800 |
C29—C30 | 1.510 (3) | C31—H31 | 0.9500 |
C30—C35 | 1.395 (3) | C32—H32 | 0.9500 |
C30—C31 | 1.389 (3) | C34—H34 | 0.9500 |
C31—C32 | 1.384 (3) | C35—H35 | 0.9500 |
C32—C33 | 1.377 (3) | ||
C1—N1—C12 | 111.93 (15) | C21—C7—H7 | 108.00 |
C1—N1—C29 | 116.78 (15) | N1—C12—H12 | 107.00 |
C12—N1—C29 | 119.69 (15) | C11—C12—H12 | 107.00 |
C3—N2—C4 | 110.96 (16) | C13—C12—H12 | 107.00 |
C6—N3—C7 | 106.09 (15) | C12—C13—H13A | 111.00 |
C9—N4—C10 | 110.73 (16) | C12—C13—H13B | 111.00 |
C4—N2—H2 | 125.00 | C14—C13—H13A | 111.00 |
C3—N2—H2 | 124.00 | C14—C13—H13B | 111.00 |
C6—N3—H3N | 113.1 (13) | H13A—C13—H13B | 109.00 |
C7—N3—H3N | 111.6 (13) | C1—C14—H14A | 111.00 |
C10—N4—H4 | 125.00 | C1—C14—H14B | 111.00 |
C9—N4—H4 | 125.00 | C13—C14—H14A | 111.00 |
N1—C1—C14 | 104.17 (16) | C13—C14—H14B | 111.00 |
N1—C1—C2 | 117.18 (16) | H14A—C14—H14B | 109.00 |
C2—C1—C14 | 115.36 (16) | C11—C15—H15A | 109.00 |
C1—C2—C28 | 105.28 (16) | C11—C15—H15B | 109.00 |
C1—C2—C3 | 115.78 (16) | C11—C15—H15C | 109.00 |
C1—C2—C27 | 111.11 (16) | H15A—C15—H15B | 110.00 |
C27—C2—C28 | 108.11 (17) | H15A—C15—H15C | 109.00 |
C3—C2—C27 | 109.37 (16) | H15B—C15—H15C | 109.00 |
C3—C2—C28 | 106.78 (16) | C11—C16—H16A | 109.00 |
C2—C3—C26 | 131.91 (18) | C11—C16—H16B | 109.00 |
N2—C3—C26 | 106.15 (17) | C11—C16—H16C | 110.00 |
N2—C3—C2 | 121.91 (17) | H16A—C16—H16B | 110.00 |
C5—C4—C25 | 130.28 (18) | H16A—C16—H16C | 109.00 |
N2—C4—C5 | 122.03 (17) | H16B—C16—H16C | 109.00 |
N2—C4—C25 | 106.35 (17) | C10—C17—H17 | 126.00 |
C4—C5—C6 | 114.84 (16) | C18—C17—H17 | 126.00 |
C6—C5—C23 | 108.88 (16) | C9—C18—H18 | 126.00 |
C4—C5—C23 | 107.28 (16) | C17—C18—H18 | 126.00 |
C4—C5—C24 | 109.32 (17) | C8—C19—H19A | 110.00 |
C6—C5—C24 | 107.66 (16) | C8—C19—H19B | 109.00 |
C23—C5—C24 | 108.73 (16) | C8—C19—H19C | 110.00 |
N3—C6—C22 | 100.71 (16) | H19A—C19—H19B | 109.00 |
N3—C6—C5 | 115.48 (16) | H19A—C19—H19C | 109.00 |
C5—C6—C22 | 118.22 (17) | H19B—C19—H19C | 109.00 |
N3—C7—C8 | 113.32 (16) | C8—C20—H20A | 109.00 |
N3—C7—C21 | 104.13 (16) | C8—C20—H20B | 109.00 |
C8—C7—C21 | 114.65 (17) | C8—C20—H20C | 109.00 |
C7—C8—C20 | 107.59 (17) | H20A—C20—H20B | 109.00 |
C9—C8—C19 | 111.74 (17) | H20A—C20—H20C | 110.00 |
C7—C8—C9 | 110.86 (16) | H20B—C20—H20C | 109.00 |
C7—C8—C19 | 109.21 (17) | C7—C21—H21A | 111.00 |
C9—C8—C20 | 108.63 (17) | C7—C21—H21B | 111.00 |
C19—C8—C20 | 108.70 (17) | C22—C21—H21A | 111.00 |
N4—C9—C8 | 122.41 (17) | C22—C21—H21B | 111.00 |
N4—C9—C18 | 106.47 (17) | H21A—C21—H21B | 109.00 |
C8—C9—C18 | 131.03 (18) | C6—C22—H22A | 111.00 |
N4—C10—C17 | 106.38 (17) | C6—C22—H22B | 111.00 |
N4—C10—C11 | 122.76 (17) | C21—C22—H22A | 111.00 |
C11—C10—C17 | 130.85 (18) | C21—C22—H22B | 111.00 |
C12—C11—C16 | 106.18 (16) | H22A—C22—H22B | 109.00 |
C10—C11—C15 | 110.31 (16) | C5—C23—H23A | 110.00 |
C15—C11—C16 | 107.75 (17) | C5—C23—H23B | 109.00 |
C10—C11—C12 | 109.88 (16) | C5—C23—H23C | 109.00 |
C10—C11—C16 | 108.21 (16) | H23A—C23—H23B | 109.00 |
C12—C11—C15 | 114.24 (17) | H23A—C23—H23C | 109.00 |
N1—C12—C13 | 101.44 (16) | H23B—C23—H23C | 109.00 |
N1—C12—C11 | 117.13 (16) | C5—C24—H24A | 109.00 |
C11—C12—C13 | 117.19 (17) | C5—C24—H24B | 109.00 |
C12—C13—C14 | 105.32 (16) | C5—C24—H24C | 109.00 |
C1—C14—C13 | 104.98 (16) | H24A—C24—H24B | 110.00 |
C10—C17—C18 | 108.17 (19) | H24A—C24—H24C | 109.00 |
C9—C18—C17 | 108.24 (19) | H24B—C24—H24C | 110.00 |
C7—C21—C22 | 105.11 (16) | C4—C25—H25 | 126.00 |
C6—C22—C21 | 102.14 (16) | C26—C25—H25 | 126.00 |
C4—C25—C26 | 108.38 (18) | C3—C26—H26 | 126.00 |
C3—C26—C25 | 108.16 (18) | C25—C26—H26 | 126.00 |
O1—C29—N1 | 122.32 (18) | C2—C27—H27A | 109.00 |
N1—C29—C30 | 120.88 (17) | C2—C27—H27B | 109.00 |
O1—C29—C30 | 116.71 (17) | C2—C27—H27C | 109.00 |
C31—C30—C35 | 118.22 (19) | H27A—C27—H27B | 109.00 |
C29—C30—C35 | 123.90 (18) | H27A—C27—H27C | 109.00 |
C29—C30—C31 | 117.07 (18) | H27B—C27—H27C | 109.00 |
C30—C31—C32 | 121.4 (2) | C2—C28—H28A | 109.00 |
C31—C32—C33 | 119.3 (2) | C2—C28—H28B | 110.00 |
Cl1—C33—C32 | 119.82 (17) | C2—C28—H28C | 109.00 |
Cl1—C33—C34 | 119.44 (17) | H28A—C28—H28B | 109.00 |
C32—C33—C34 | 120.7 (2) | H28A—C28—H28C | 109.00 |
C33—C34—C35 | 119.6 (2) | H28B—C28—H28C | 109.00 |
C30—C35—C34 | 120.75 (19) | C30—C31—H31 | 119.00 |
N1—C1—H1 | 106.00 | C32—C31—H31 | 119.00 |
C2—C1—H1 | 106.00 | C31—C32—H32 | 120.00 |
C14—C1—H1 | 106.00 | C33—C32—H32 | 120.00 |
N3—C6—H6 | 107.00 | C33—C34—H34 | 120.00 |
C5—C6—H6 | 107.00 | C35—C34—H34 | 120.00 |
C22—C6—H6 | 107.00 | C30—C35—H35 | 120.00 |
N3—C7—H7 | 108.00 | C34—C35—H35 | 120.00 |
C8—C7—H7 | 108.00 | ||
C12—N1—C1—C2 | 126.13 (17) | C24—C5—C6—C22 | 50.7 (2) |
C12—N1—C1—C14 | −2.6 (2) | N3—C6—C22—C21 | 43.55 (18) |
C29—N1—C1—C2 | −90.6 (2) | C5—C6—C22—C21 | 170.30 (17) |
C29—N1—C1—C14 | 140.62 (17) | N3—C7—C8—C9 | −74.1 (2) |
C1—N1—C12—C11 | −106.27 (18) | N3—C7—C8—C19 | 49.4 (2) |
C1—N1—C12—C13 | 22.59 (19) | N3—C7—C8—C20 | 167.26 (17) |
C29—N1—C12—C11 | 111.7 (2) | C21—C7—C8—C9 | 45.3 (2) |
C29—N1—C12—C13 | −119.47 (18) | C21—C7—C8—C19 | 168.80 (17) |
C1—N1—C29—O1 | 11.0 (3) | C21—C7—C8—C20 | −73.4 (2) |
C1—N1—C29—C30 | −172.54 (16) | N3—C7—C21—C22 | −0.6 (2) |
C12—N1—C29—O1 | 151.33 (18) | C8—C7—C21—C22 | −124.95 (18) |
C12—N1—C29—C30 | −32.3 (3) | C7—C8—C9—N4 | 53.4 (2) |
C4—N2—C3—C2 | 178.98 (17) | C7—C8—C9—C18 | −122.6 (2) |
C4—N2—C3—C26 | 0.8 (2) | C19—C8—C9—N4 | −68.7 (2) |
C3—N2—C4—C5 | −168.17 (18) | C19—C8—C9—C18 | 115.3 (2) |
C3—N2—C4—C25 | −0.2 (2) | C20—C8—C9—N4 | 171.42 (18) |
C7—N3—C6—C5 | −174.32 (16) | C20—C8—C9—C18 | −4.6 (3) |
C7—N3—C6—C22 | −45.77 (18) | N4—C9—C18—C17 | −0.3 (2) |
C6—N3—C7—C8 | 154.10 (16) | C8—C9—C18—C17 | 176.2 (2) |
C6—N3—C7—C21 | 28.87 (19) | N4—C10—C11—C12 | 84.7 (2) |
C10—N4—C9—C8 | −176.00 (18) | N4—C10—C11—C15 | −42.2 (3) |
C10—N4—C9—C18 | 0.9 (2) | N4—C10—C11—C16 | −159.80 (18) |
C9—N4—C10—C11 | 177.92 (17) | C17—C10—C11—C12 | −96.6 (3) |
C9—N4—C10—C17 | −1.1 (2) | C17—C10—C11—C15 | 136.6 (2) |
N1—C1—C2—C3 | −76.6 (2) | C17—C10—C11—C16 | 18.9 (3) |
N1—C1—C2—C27 | 48.9 (2) | N4—C10—C17—C18 | 0.9 (2) |
N1—C1—C2—C28 | 165.73 (16) | C11—C10—C17—C18 | −178.0 (2) |
C14—C1—C2—C3 | 46.6 (2) | C10—C11—C12—N1 | −53.0 (2) |
C14—C1—C2—C27 | 172.15 (17) | C10—C11—C12—C13 | −173.86 (17) |
C14—C1—C2—C28 | −71.0 (2) | C15—C11—C12—N1 | 71.6 (2) |
N1—C1—C14—C13 | −18.9 (2) | C15—C11—C12—C13 | −49.3 (2) |
C2—C1—C14—C13 | −148.75 (17) | C16—C11—C12—N1 | −169.75 (16) |
C1—C2—C3—N2 | 108.6 (2) | C16—C11—C12—C13 | 69.3 (2) |
C1—C2—C3—C26 | −73.8 (3) | N1—C12—C13—C14 | −33.75 (19) |
C27—C2—C3—N2 | −17.9 (3) | C11—C12—C13—C14 | 95.1 (2) |
C27—C2—C3—C26 | 159.7 (2) | C12—C13—C14—C1 | 33.4 (2) |
C28—C2—C3—N2 | −134.63 (19) | C10—C17—C18—C9 | −0.3 (3) |
C28—C2—C3—C26 | 43.0 (3) | C7—C21—C22—C6 | −26.4 (2) |
N2—C3—C26—C25 | −1.1 (2) | C4—C25—C26—C3 | 1.1 (3) |
C2—C3—C26—C25 | −179.0 (2) | O1—C29—C30—C31 | 65.7 (3) |
N2—C4—C5—C6 | −51.8 (3) | O1—C29—C30—C35 | −103.8 (2) |
N2—C4—C5—C23 | 69.4 (2) | N1—C29—C30—C31 | −110.9 (2) |
N2—C4—C5—C24 | −172.90 (18) | N1—C29—C30—C35 | 79.6 (3) |
C25—C4—C5—C6 | 143.4 (2) | C29—C30—C31—C32 | −171.7 (2) |
C25—C4—C5—C23 | −95.5 (3) | C35—C30—C31—C32 | −1.6 (3) |
C25—C4—C5—C24 | 22.3 (3) | C29—C30—C35—C34 | 169.84 (19) |
N2—C4—C25—C26 | −0.5 (2) | C31—C30—C35—C34 | 0.4 (3) |
C5—C4—C25—C26 | 166.1 (2) | C30—C31—C32—C33 | 1.6 (3) |
C4—C5—C6—N3 | 48.0 (2) | C31—C32—C33—Cl1 | 177.89 (18) |
C4—C5—C6—C22 | −71.3 (2) | C31—C32—C33—C34 | −0.4 (3) |
C23—C5—C6—N3 | −72.3 (2) | Cl1—C33—C34—C35 | −179.02 (17) |
C23—C5—C6—C22 | 168.44 (17) | C32—C33—C34—C35 | −0.8 (3) |
C24—C5—C6—N3 | 170.03 (16) | C33—C34—C35—C30 | 0.7 (3) |
Cg1 is the centroid of pyrrole ring N2/C3/C4/C25/C26; Cg2 is the centroid of the benzene ring C30–C35. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···N3 | 0.88 | 2.31 | 2.865 (2) | 121 |
N4—H4···N3 | 0.88 | 2.55 | 3.051 (2) | 117 |
C15—H15A···N2 | 0.98 | 2.52 | 3.488 (3) | 171 |
C15—H15A···Cg1 | 0.98 | 2.40 | 3.301 (2) | 152 |
N3—H3N···O1i | 0.882 (18) | 2.257 (18) | 3.105 (2) | 161.1 (18) |
C23—H23B···O1i | 0.98 | 2.53 | 3.495 (3) | 168 |
C27—H27C···Cg2i | 0.98 | 2.82 | 3.702 (2) | 150 |
Symmetry code: (i) −x+3/2, y−1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C35H47ClN4O |
Mr | 575.22 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 173 |
a, b, c (Å) | 10.3224 (6), 12.0389 (4), 25.3311 (13) |
β (°) | 96.798 (4) |
V (Å3) | 3125.8 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.16 |
Crystal size (mm) | 0.45 × 0.42 × 0.40 |
Data collection | |
Diffractometer | Stoe IPDS 2 |
Absorption correction | Multi-scan (MULscanABS in PLATON; Spek, 2009) |
Tmin, Tmax | 0.973, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 32665, 5906, 4215 |
Rint | 0.076 |
(sin θ/λ)max (Å−1) | 0.609 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.053, 0.102, 1.03 |
No. of reflections | 5906 |
No. of parameters | 381 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.24, −0.34 |
Computer programs: X-AREA (Stoe & Cie, 2009), X-RED32 (Stoe & Cie, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).
Cg1 is the centroid of pyrrole ring N2/C3/C4/C25/C26; Cg2 is the centroid of the benzene ring C30–C35. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···N3 | 0.88 | 2.31 | 2.865 (2) | 121 |
N4—H4···N3 | 0.88 | 2.55 | 3.051 (2) | 117 |
C15—H15A···N2 | 0.98 | 2.52 | 3.488 (3) | 171 |
C15—H15A···Cg1 | 0.98 | 2.40 | 3.301 (2) | 152 |
N3—H3N···O1i | 0.882 (18) | 2.257 (18) | 3.105 (2) | 161.1 (18) |
C23—H23B···O1i | 0.98 | 2.53 | 3.495 (3) | 168 |
C27—H27C···Cg2i | 0.98 | 2.82 | 3.702 (2) | 150 |
Symmetry code: (i) −x+3/2, y−1/2, −z+1/2. |
Acknowledgements
HSE thanks the staff of the XRD Application Laboratory, CSEM, Neuchâtel for access to the X-ray diffraction equipment.
References
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We have recently reported the access to new macrocycles by heterogeneous catalytic hydrogenation of meso-octamethylcalix[4]pyrrole, which gave meso-octamethylcalix[2]pyrrole[2]pyrrolidine (1 in Fig. 3) [Blangy et al., 2009]. It was decided to investigate the nucleophilicity of this new macrocycle, which showed interesting reactivity (Journot & Neier, 2012), by reacting different substituted benzoyl chlorides with the macrocycle under smooth conditions [Journot et al., 2012a; Zhang et al., 2009]. Herein, we report on the synthesis and crystal structure of the title 4-chlorobenzoyl derivative, one of five compounds that have been studied by X-ray diffraction analysis (Journot et al., 2012b,c,d,e).
The molecular structure of the title compound is given in Fig. 1. The two pyrrolidine rings (N1,C1,C12—C14) and (N3,C6,C7,C21,C22) have envelope conformations with, respectively, atoms C13 and C6 as the flaps. The conformation of the macrocycle is stabilized by intramolecular N—H···N hydrogen bonds involving atom N3 and the two pyrrole H atoms, H2 and H4 (Fig. 1 and Table 1). The benzoyl ring (C30—C35) is inclined to the pyrrole ring (N4,C9,C10,C17,C18) by 11.66 (11)°, with a centroid-to-centroid distance of 3.7488 (13) Å. The methyl group C15 is also in close contact with the pyrrole ring (N2,C3,C4,C25,C26), with a short C15—H15A···N2 interaction and a C15—H15A···centroid distance of 3.301 (2) [see Table 1].
In the crystal, molecules are linked via an N—H···O hydrogen bond, involving the N3 pyrrolidine H-atom (H3N) and the benzoyl O atom (O1), leading to the formation of helical chains propagating along [010] - see Fig. 2 and Table 1. The same O atom is involved in a C—H···O contact with methyl group C23. A C—H···π interaction is also observed, involving the methyl group C27 and the benzoyl ring (C30—C35) [see Table 1].
The overall geometry and crystal packing is very similar to that reported for the 4-methoxybenzoyl derivative (Journot et al., 2012b), and the 4-nitrobenzoyl (Journot et al., 2012d) and 4-methylbenzoyl (Journot et al., 2012e) derivatives. The benzoyl derivative (Journot et al., 2012c) crystallized, in the trigonal space group R-3, as a partial (0.25H2O) hydrate, and forms hydrogen bonded chains propagating along [001].
Footnote to Table 1: Cg1 is the centroid of pyrrole ring (N2,C3,C4,C25,C26); Cg2 is the centroid of the benzene ring (C30—C35).