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The structure of the title compound, C20H18ClNO2·0.5CH2Cl2, at 173 K is described. There is one crystallographically distinct mol­ecule which forms centrosymmetric dimers through N—H...O hydrogen bonding. The dichloro­methane solvent mol­ecule is disordered across an inversion centre.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536806052202/hg2150sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536806052202/hg2150Isup2.hkl
Contains datablock I

CCDC reference: 633878

Key indicators

  • Single-crystal X-ray study
  • T = 173 K
  • Mean [sigma](C-C) = 0.004 Å
  • Disorder in solvent or counterion
  • R factor = 0.051
  • wR factor = 0.156
  • Data-to-parameter ratio = 13.4

checkCIF/PLATON results

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Alert level B PLAT148_ALERT_3_B su on the b - Axis is Too Large (x 1000) . 11 Ang. PLAT149_ALERT_3_B su on the gamma Angle is Too Large (x 100) .. 7 Deg.
Alert level C PLAT041_ALERT_1_C Calc. and Rep. SumFormula Strings Differ .... ? PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ .... ? PLAT045_ALERT_1_C Calculated and Reported Z Differ by ............ 0.50 Ratio PLAT244_ALERT_4_C Low 'Solvent' Ueq as Compared to Neighbors for C21 PLAT302_ALERT_4_C Anion/Solvent Disorder ......................... 50.00 Perc.
0 ALERT level A = In general: serious problem 2 ALERT level B = Potentially serious problem 5 ALERT level C = Check and explain 0 ALERT level G = General alerts; check 3 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 0 ALERT type 2 Indicator that the structure model may be wrong or deficient 2 ALERT type 3 Indicator that the structure quality may be low 2 ALERT type 4 Improvement, methodology, query or suggestion 0 ALERT type 5 Informative message, check

Computing details top

Data collection: CAD-4 EXPRESS (Enraf–Nonius, 1994); cell refinement: CAD-4 EXPRESS; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: X-SEED (Barbour, 2001) and ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Methyl 4-chloro-3,5-di-p-tolyl-1H-pyrrole-2-carboxylate dichloromethane hemisolvate top
Crystal data top
C20H18ClNO2·0.5CH2Cl2Z = 2
Mr = 382.27F(000) = 398
Triclinic, P1Dx = 1.350 Mg m3
Hall symbol: -P 1Melting point = 452–458 K
a = 8.456 (3) ÅMo Kα radiation, λ = 0.71073 Å
b = 9.902 (11) ÅCell parameters from 25 reflections
c = 12.316 (3) Åθ = 9.6–14.1°
α = 71.61 (5)°µ = 0.36 mm1
β = 82.94 (3)°T = 173 K
γ = 74.33 (7)°Plate, colourless
V = 941.4 (11) Å30.45 × 0.40 × 0.30 mm
Data collection top
Enraf–Nonius TurboCAD-4
diffractometer
Rint = 0.049
Radiation source: fine-focus sealed tubeθmax = 25.0°, θmin = 1.7°
Graphite monochromatorh = 910
non–profiled ω/2θ scansk = 1111
3482 measured reflectionsl = 014
3314 independent reflections3 standard reflections every 60 min
2791 reflections with I > 2σ(I) intensity decay: 5%
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.051Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.156H-atom parameters constrained
S = 1.05 w = 1/[σ2(Fo2) + (0.0933P)2 + 0.75P]
where P = (Fo2 + 2Fc2)/3
3314 reflections(Δ/σ)max < 0.001
247 parametersΔρmax = 0.36 e Å3
0 restraintsΔρmin = 0.48 e Å3
Special details top

Experimental. Iodine (1.28 g, 10.02 mmol) was added to a mixture of methyl 4-chloro-1H-pyrrole-2-carboxylate (0.80 g, 5.01 mmol) and silver trifluoroacetate (2.21 g, 10.02 mmol) in chloroform (20 ml) at 273 K (ice bath) under a nitrogen atmosphere. The reaction mixture was stirred at room temperature for 7 h with exclusion of light, before quenching with aqueous sodium sulfite and brine solution. The reaction mixture was extracted with ethyl acetate (3 × 20 ml), and the combined organic extracts were dried and filtered through a small plug of silica gel. The solution was concentrated under reduced pressure to give methyl 4-chloro-3,5-diiodo-1H-pyrrole-2-carboxylate (1.85 g, 90%) as a white solid (m.p. 465–470 K). Spectroscopic analysis: 1H NMR (300 MHz, CDCl3, δ, p.p.m.): 3.92 (3H, s), 9.69 (1H, bs); IR (Medium?, ν, cm-1): 3242, 1681, 1445, 1391, 1238.

A solution of the diiodopyrrole from above (0.216 g, 0.525 mmol) in acetone (10 ml), p-tolylboronic acid (0.179 g, 1.313 mmol), 2M potassium carbonate (5 ml) and palladium acetate (0.020 g, 0.089 mmol) was refluxed overnight under an atmosphere of nitrogen. The reaction was cooled to room temperature, quenched by the addition of water (10 ml) and extracted with ethyl acetate (2 × 10 ml). The organic layer was dried and evaporated to give the crude product, which was purified by silica-gel chromatography (eluent 20% ethyl acetate–hexanes). The product was recrystallized from diethyl ether–hexane (1:4 v/v) to give the title compound, (I), in 78% yield as colourless crystals. Crystals of (I) suitable for X-ray analysis were obtained by recrystallization from dichloromethane (m.p. 452–458 K). Spectroscopic analysis: 1H NMR (300 MHz, CDCl3, δ, p.p.m.): 2.41 (6H, s), 3.73 (3H, s), 7.27 (6H, m), 7.64 (2H, m), 9.20 (1H, bs); 13C NMR (75 MHz, CDCl3, δ, p.p.m.): 21.68, 21.74, 51.91, 127.28, 127.41, 128.38, 128.76, 129.38, 129.78, 129.93, 130.48, 130.72, 137.70, 138.93, 161.49; IR (Medium?, ν, cm-1): 3288, 1676, 1450, 1292; MS m/z 341 (M+, 37Cl, 20%), 339 (M+, 35Cl, 55%), 309 (20%), 307 (60%), 244 (100%).

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Least-squares planes (x,y,z in crystal coordinates) and deviations from them (* indicates atom used to define plane)

4.2020 (0.0097) x + 7.8660 (0.0087) y - 2.9795 (0.0158) z = 6.1041 (0.0112)

* 0.0053 (0.0015) N1 * -0.0032 (0.0016) C1 * -0.0001 (0.0015) C2 * 0.0033 (0.0015) C3 * -0.0053 (0.0015) C4 - 0.0861 (0.0044) C5 0.0419 (0.0043) C7 - 0.0202 (0.0041) Cl1 - 0.1076 (0.0044) C14

Rms deviation of fitted atoms = 0.0039

0.5892 (0.0091) x - 2.8203 (0.0103) y + 10.0172 (0.0092) z = 0.4353 (0.0100)

Angle to previous plane (with approximate e.s.d.) = 46.78 (0.12)

* 0.0044 (0.0017) C7 * -0.0074 (0.0018) C8 * 0.0037 (0.0019) C9 * 0.0031 (0.0019) C10 * -0.0061 (0.0019) C11 * 0.0024 (0.0018) C12 - 0.0055 (0.0039) C2 0.0375 (0.0050) C13

Rms deviation of fitted atoms = 0.0048

3.4886 (0.0080) x + 9.7512 (0.0054) y + 2.9889 (0.0136) z = 9.4452 (0.0081)

Angle to previous plane (with approximate e.s.d.) = 70.64 (0.10)

* 0.0034 (0.0018) C14 * 0.0013 (0.0019) C15 * -0.0021 (0.0019) C16 * -0.0019 (0.0019) C17 * 0.0068 (0.0019) C18 * -0.0075 (0.0018) C19 - 0.0374 (0.0038) C4 - 0.0089 (0.0046) C20

Rms deviation of fitted atoms = 0.0045

4.4354 (0.0079) x + 6.9848 (0.0056) y - 4.3081 (0.0100) z = 4.8307 (0.0090)

Angle to previous plane (with approximate e.s.d.) = 37.24 (0.09)

* -0.1042 (0.0011) H1 * 0.0038 (0.0010) N1 * 0.1013 (0.0020) C1 * -0.0729 (0.0018) C5 * -0.0189 (0.0020) O2 * 0.1042 (0.0011) H1_$2 * -0.0038 (0.0010) N1_$2 * -0.1013 (0.0020) C1_$2 * 0.0729 (0.0018) C5_$2 * 0.0189 (0.0020) O2_$2

Rms deviation of fitted atoms = 0.0732

5.7205 (0.0088) x + 6.3705 (0.0109) y - 3.7855 (0.0170) z = 4.7726 (0.0155)

Angle to previous plane (with approximate e.s.d.) = 11.18 (0.19)

* -0.0022 (0.0006) C1 * 0.0075 (0.0021) C5 * -0.0024 (0.0007) O1 * -0.0029 (0.0008) O2 0.0201 (0.0048) C6 - 0.0603 (0.0053) H1_$2

Rms deviation of fitted atoms = 0.0043

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. All H atoms were calculated using the riding model of SHELXL. The dichloromethane solvent molecule contains a disorder about a inversion centre and was modeled with anisotropically refined carbon and chlorine atoms.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Cl10.00913 (7)0.80466 (8)0.06952 (5)0.0334 (2)
O10.3575 (2)0.7011 (2)0.46000 (15)0.0343 (4)
O20.1835 (2)0.8887 (2)0.51273 (17)0.0426 (5)
N10.0268 (3)0.9212 (2)0.34383 (18)0.0291 (5)
H10.07410.96710.39450.035*
C10.1325 (3)0.8366 (3)0.3481 (2)0.0263 (5)
C20.1660 (3)0.7834 (3)0.2537 (2)0.0255 (5)
C30.0179 (3)0.8402 (3)0.1937 (2)0.0279 (5)
C40.1012 (3)0.9242 (3)0.2504 (2)0.0274 (5)
C50.2246 (3)0.8146 (3)0.4476 (2)0.0275 (5)
C60.4588 (4)0.6703 (4)0.5553 (3)0.0448 (7)
H6A0.52450.74290.53810.067*
H6B0.53210.57180.56840.067*
H6C0.38860.67530.62420.067*
C70.3247 (3)0.6910 (3)0.2193 (2)0.0258 (5)
C80.4724 (3)0.7283 (3)0.2200 (2)0.0286 (5)
H80.47230.81210.24200.034*
C90.6204 (3)0.6427 (3)0.1883 (2)0.0334 (6)
H90.72000.66850.19050.040*
C100.6259 (3)0.5205 (3)0.1535 (2)0.0344 (6)
C110.4769 (3)0.4858 (3)0.1516 (2)0.0348 (6)
H110.47600.40390.12740.042*
C120.3295 (3)0.5700 (3)0.1848 (2)0.0322 (6)
H120.22990.54350.18360.039*
C130.7868 (4)0.4264 (4)0.1210 (3)0.0536 (8)
H13A0.86880.48470.09630.080*
H13B0.76980.39130.05830.080*
H13C0.82590.34210.18730.080*
C140.2770 (3)0.9975 (3)0.2302 (2)0.0259 (5)
C150.3381 (3)1.0526 (3)0.1211 (2)0.0332 (6)
H150.26551.04650.05660.040*
C160.5055 (3)1.1170 (3)0.1053 (2)0.0352 (6)
H160.54491.15390.02990.042*
C170.6164 (3)1.1283 (3)0.1979 (2)0.0322 (6)
C180.5543 (3)1.0736 (3)0.3066 (2)0.0332 (6)
H180.62671.08150.37090.040*
C190.3873 (3)1.0073 (3)0.3236 (2)0.0317 (6)
H190.34840.96840.39910.038*
C200.7974 (4)1.1977 (4)0.1804 (3)0.0464 (8)
H20A0.84921.12820.16570.070*
H20B0.81131.28670.11490.070*
H20C0.84911.22330.24930.070*
C210.0720 (12)0.5340 (11)0.4882 (11)0.086 (3)0.50
H21A0.09550.63530.43540.104*0.50
H21B0.17740.50930.52030.104*0.50
Cl20.0530 (8)0.5169 (8)0.5978 (4)0.155 (2)0.50
Cl30.0446 (5)0.4064 (5)0.4155 (4)0.1078 (14)0.50
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cl10.0291 (3)0.0534 (4)0.0271 (3)0.0123 (3)0.0011 (2)0.0239 (3)
O10.0335 (10)0.0438 (11)0.0287 (9)0.0024 (8)0.0070 (8)0.0189 (8)
O20.0353 (11)0.0632 (13)0.0403 (11)0.0037 (9)0.0051 (8)0.0364 (10)
N10.0249 (11)0.0437 (12)0.0264 (11)0.0095 (9)0.0027 (8)0.0216 (10)
C10.0211 (12)0.0351 (13)0.0276 (12)0.0075 (10)0.0010 (9)0.0164 (10)
C20.0239 (12)0.0334 (13)0.0247 (12)0.0115 (10)0.0030 (9)0.0140 (10)
C30.0277 (12)0.0428 (14)0.0221 (12)0.0168 (11)0.0038 (10)0.0170 (11)
C40.0236 (12)0.0390 (14)0.0255 (12)0.0123 (10)0.0019 (9)0.0150 (10)
C50.0224 (12)0.0372 (14)0.0276 (12)0.0080 (10)0.0032 (10)0.0173 (11)
C60.0451 (17)0.0507 (18)0.0399 (16)0.0017 (14)0.0186 (13)0.0174 (14)
C70.0225 (12)0.0360 (13)0.0202 (11)0.0094 (10)0.0011 (9)0.0091 (10)
C80.0286 (13)0.0353 (13)0.0266 (12)0.0116 (11)0.0022 (10)0.0136 (10)
C90.0240 (13)0.0449 (15)0.0322 (14)0.0105 (11)0.0026 (10)0.0123 (12)
C100.0316 (14)0.0432 (16)0.0267 (13)0.0044 (12)0.0035 (10)0.0138 (12)
C110.0407 (15)0.0392 (15)0.0306 (13)0.0100 (12)0.0009 (11)0.0196 (12)
C120.0286 (13)0.0462 (15)0.0287 (13)0.0139 (11)0.0011 (10)0.0176 (12)
C130.0383 (17)0.067 (2)0.055 (2)0.0010 (15)0.0058 (14)0.0306 (17)
C140.0224 (12)0.0332 (13)0.0283 (12)0.0105 (10)0.0014 (10)0.0155 (10)
C150.0300 (13)0.0450 (15)0.0277 (13)0.0123 (12)0.0035 (10)0.0143 (12)
C160.0348 (14)0.0419 (15)0.0301 (14)0.0082 (12)0.0065 (11)0.0111 (12)
C170.0260 (13)0.0352 (14)0.0402 (15)0.0069 (11)0.0030 (11)0.0180 (12)
C180.0261 (13)0.0466 (16)0.0365 (14)0.0122 (11)0.0047 (11)0.0250 (12)
C190.0274 (13)0.0487 (16)0.0273 (13)0.0139 (11)0.0006 (10)0.0194 (12)
C200.0286 (15)0.0563 (19)0.0565 (19)0.0022 (13)0.0101 (13)0.0235 (16)
C210.080 (6)0.071 (6)0.108 (8)0.033 (5)0.009 (6)0.018 (6)
Cl20.191 (5)0.235 (6)0.072 (2)0.168 (5)0.011 (3)0.006 (3)
Cl30.116 (3)0.117 (3)0.089 (3)0.048 (2)0.049 (2)0.031 (2)
Geometric parameters (Å, º) top
Cl1—C31.727 (2)C11—C121.395 (4)
O1—C51.341 (3)C11—H110.9500
O1—C61.444 (3)C12—H120.9500
O2—C51.211 (3)C13—H13A0.9800
N1—C41.367 (3)C13—H13B0.9800
N1—C11.378 (3)C13—H13C0.9800
N1—H10.8800C14—C151.388 (4)
C1—C21.390 (3)C14—C191.399 (4)
C1—C51.460 (3)C15—C161.396 (4)
C2—C31.420 (4)C15—H150.9500
C2—C71.504 (4)C16—C171.398 (4)
C3—C41.391 (4)C16—H160.9500
C4—C141.480 (4)C17—C181.387 (4)
C6—H6A0.9800C17—C201.510 (4)
C6—H6B0.9800C18—C191.398 (4)
C6—H6C0.9800C18—H180.9500
C7—C121.381 (4)C19—H190.9500
C7—C81.397 (3)C20—H20A0.9800
C8—C91.397 (4)C20—H20B0.9800
C8—H80.9500C20—H20C0.9800
C9—C101.393 (4)C21—Cl21.755 (13)
C9—H90.9500C21—Cl31.787 (13)
C10—C111.398 (4)C21—H21A0.9900
C10—C131.516 (4)C21—H21B0.9900
C5—O1—C6117.0 (2)C7—C12—C11121.6 (2)
C4—N1—C1110.8 (2)C7—C12—H12119.2
C4—N1—H1124.6C11—C12—H12119.2
C1—N1—H1124.6C10—C13—H13A109.5
N1—C1—C2108.7 (2)C10—C13—H13B109.5
N1—C1—C5117.2 (2)H13A—C13—H13B109.5
C2—C1—C5134.0 (2)C10—C13—H13C109.5
C1—C2—C3104.7 (2)H13A—C13—H13C109.5
C1—C2—C7128.2 (2)H13B—C13—H13C109.5
C3—C2—C7127.1 (2)C15—C14—C19118.3 (2)
C4—C3—C2110.5 (2)C15—C14—C4122.0 (2)
C4—C3—Cl1125.5 (2)C19—C14—C4119.6 (2)
C2—C3—Cl1123.97 (19)C14—C15—C16120.6 (2)
N1—C4—C3105.3 (2)C14—C15—H15119.7
N1—C4—C14122.0 (2)C16—C15—H15119.7
C3—C4—C14132.6 (2)C15—C16—C17121.4 (2)
O2—C5—O1124.0 (2)C15—C16—H16119.3
O2—C5—C1123.6 (2)C17—C16—H16119.3
O1—C5—C1112.3 (2)C18—C17—C16117.6 (2)
O1—C6—H6A109.5C18—C17—C20121.1 (3)
O1—C6—H6B109.5C16—C17—C20121.3 (3)
H6A—C6—H6B109.5C17—C18—C19121.4 (2)
O1—C6—H6C109.5C17—C18—H18119.3
H6A—C6—H6C109.5C19—C18—H18119.3
H6B—C6—H6C109.5C18—C19—C14120.6 (2)
C12—C7—C8118.3 (2)C18—C19—H19119.7
C12—C7—C2121.9 (2)C14—C19—H19119.7
C8—C7—C2119.8 (2)C17—C20—H20A109.5
C7—C8—C9120.1 (2)C17—C20—H20B109.5
C7—C8—H8120.0H20A—C20—H20B109.5
C9—C8—H8120.0C17—C20—H20C109.5
C10—C9—C8121.9 (2)H20A—C20—H20C109.5
C10—C9—H9119.1H20B—C20—H20C109.5
C8—C9—H9119.1Cl2—C21—Cl3104.8 (5)
C9—C10—C11117.4 (2)Cl2—C21—H21A110.8
C9—C10—C13121.8 (3)Cl3—C21—H21A110.8
C11—C10—C13120.8 (3)Cl2—C21—H21B110.8
C12—C11—C10120.7 (2)Cl3—C21—H21B110.8
C12—C11—H11119.6H21A—C21—H21B108.9
C10—C11—H11119.6
C4—N1—C1—C20.9 (3)C3—C2—C7—C8131.1 (3)
C4—N1—C1—C5175.9 (2)C12—C7—C8—C91.2 (4)
N1—C1—C2—C30.3 (3)C2—C7—C8—C9179.9 (2)
C5—C1—C2—C3175.7 (3)C7—C8—C9—C101.1 (4)
N1—C1—C2—C7177.6 (2)C8—C9—C10—C110.1 (4)
C5—C1—C2—C76.3 (5)C8—C9—C10—C13179.0 (3)
C1—C2—C3—C40.3 (3)C9—C10—C11—C120.8 (4)
C7—C2—C3—C4178.3 (2)C13—C10—C11—C12178.1 (3)
C1—C2—C3—Cl1178.87 (19)C8—C7—C12—C110.2 (4)
C7—C2—C3—Cl13.1 (4)C2—C7—C12—C11179.1 (2)
C1—N1—C4—C31.0 (3)C10—C11—C12—C70.8 (4)
C1—N1—C4—C14175.1 (2)N1—C4—C14—C15153.9 (3)
C2—C3—C4—N10.8 (3)C3—C4—C14—C1531.2 (4)
Cl1—C3—C4—N1179.35 (19)N1—C4—C14—C1928.6 (4)
C2—C3—C4—C14174.7 (3)C3—C4—C14—C19146.3 (3)
Cl1—C3—C4—C143.9 (4)C19—C14—C15—C160.4 (4)
C6—O1—C5—O22.1 (4)C4—C14—C15—C16178.0 (2)
C6—O1—C5—C1179.4 (2)C14—C15—C16—C170.1 (4)
N1—C1—C5—O215.9 (4)C15—C16—C17—C180.2 (4)
C2—C1—C5—O2168.4 (3)C15—C16—C17—C20179.9 (3)
N1—C1—C5—O1162.7 (2)C16—C17—C18—C191.1 (4)
C2—C1—C5—O113.1 (4)C20—C17—C18—C19179.0 (3)
C1—C2—C7—C12134.7 (3)C17—C18—C19—C141.6 (4)
C3—C2—C7—C1247.8 (4)C15—C14—C19—C181.3 (4)
C1—C2—C7—C846.4 (4)C4—C14—C19—C18178.9 (2)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H1···O2i0.882.062.932 (3)169
Symmetry code: (i) x, y+2, z+1.
 

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