organic compounds
[8-(4-Butoxybenzoyl)-2,7-dimethoxynaphthalen-1-yl](4-butoxyphenyl)methanone
aDepartment of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture & Technology, Koganei, Tokyo 184-8588, Japan
*Correspondence e-mail: aokamoto@cc.tuat.ac.jp
The molecule of the title compound, C34H36O6, is located on a twofold rotation axis. The two 4-butoxybenzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost antiparallel. The dihedral angles between the benzene rings and the naphthalene ring system are 71.70 (4)°. In the crystal, the molecules are connected via C—H⋯π interactions into a layer parallel to (010).
Related literature
For electrophilic aromatic aroylation of the naphthalene core, see: Okamoto & Yonezawa (2009); Okamoto et al. (2011). For the structures of closely related compounds, see: Hijikata et al. (2010); Muto et al. (2010); Nakaema et al. (2008); Watanabe et al. (2010); Sasagawa et al. (2011).
Experimental
Crystal data
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Refinement
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Data collection: PROCESS-AUTO (Rigaku, 1998); cell PROCESS-AUTO; data reduction: CrystalStructure (Rigaku, 2010); program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536811048550/gk2430sup1.cif
contains datablocks 1_8-obu-shelxl, global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811048550/gk2430Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811048550/gk2430Isup3.cml
The title compound was prepared by SN2 reaction of 1,8-bis(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene (1.0 mmol, 428.5 mg), which was obtained via SNAr reaction of 1,8-bis(4-fluorobenzoyl)-2,7-dimethoxynaphthalene with sodium hydroxide, with bromobutane (3.0 mmol, 411 mg) and potassium carbonate (2.8 mmol, 387 mg) in N,N-dimethylformamide (DMF; 2.5 ml). After the reaction mixture was stirred at 333 K for 6 h, it was poured into water (30 ml) and the mixture was extracted with CHCl3 (15 ml × 3). The combined extracts were washed with brine. The organic layers thus obtained were dried over anhydrous MgSO4. The solvent was removed under reduced pressure to give cake (96% yield). The crude product was purified by recrystallization from methanol (isolated yield 65%). Furthermore, the isolated product was crystallized from methanol to give single crystal. Spectroscopic data:1H NMR δ(300 MHz, CDCl3); 0.98(6H, t, J = 7.2), 1.49(4H, m, J = 7.5 Hz), 1.77(4H, q, J = 8.1 Hz), 3.70(6H, s), 3.98(4H, m), 6.80(4H, broad), 7.20(2H, d, J = 9.0 Hz), 7.65(4H, broad), 7.92(2H, d, J = 9.3 Hz) p.p.m.. 13C NMR δ(100 MHz, CDCl3); 13.8, 19.2, 31.2, 56.5, 67.7, 111.3, 113.4, 122.0, 125.6, 129.6, 131.4, 131.6, 131.8, 155.9, 162.7, 194.9 p.p.m.. IR (KBr); 2956, 2936, 1665, 1600, 1509, 1267, 1250 cm-1. (m/z): [M + H]+ Calcd for C34H37O6, 541.2590; found, 541.2559. m.p. = 392–399.9 K
All H atoms were found in a difference map and were subsequently refined as riding atoms, with C—H = 0.95 -0.99 Å, and with Uĩso(H) = 1.2 Ueq(C).
In the course of our study on electrophilic aromatic aroylation of the naphthalene core, 1,8-diaroylnaphthalene compounds have proved to be formed regioselectively by the aid of a suitable acidic mediator (Okamoto & Yonezawa, 2009, Okamoto et al., 2011). Recently, we have reported the X-ray crystal structures of 1,8-diaroylated 2,7-dimethoxynaphthalene derivatives such as 1,8-dibenzoyl-2,7-dimethoxynaphthalene (Nakaema et al., 2008), (2,7-dimethoxynaphthalene-1,8-diyl)bis(4-fluorophenyl)dimethanone [1,8-bis(4-fluorobenzoyl)-2,7-dimethoxynaphthalene] (Watanabe, Nagasawa et al., 2010), 1,8-bis(4-methylbenzoyl)-2,7-dimethoxynaphthalene (Muto et al., 2010), and {8-[4-(bromomethyl)benzoyl]-2,7-dimethoxynaphthalen-1-yl}[4-(bromomethyl)phenyl]methanone [1,8-bis(4-bromomethylbenzoyl)-2,7-dimethoxynaphthalene] (Sasagawa et al., 2011). The aroyl groups in these compounds are perpendicularly attached to the naphthalene rings and oriented in opposite directions. On the other hand, X-ray structure of 2,7-dimethoxy-1,8-bis(4-phenoxybenzoyl)naphthalene (Hijikata et al., 2010) having the aroyl groups oriented in the same directions has been also revealed. As a part of our ongoing studies on the molecular structures of this kind of homologous molecules, the X-ray
of title compound, 1,8-diaroylnaphthalene bearing butoxy groups, is discussed in this article.The molecular structure of the title compound is displayed in Fig 1. The molecule of (I) lies on a crystallographic 2-fold axis so that the
contains one-half of the molecule. Thus, two 4-butoxybenzoyl groups are situated in anti orientation and are twisted away from the attached naphthalene ring. The dihedral angle between the best planes of the 4-butoxyphenyl groups and the naphthalene ring system is 71.70 (4)°.The dihedral between the naphthalene ring system and the bridging carbonyl C—C(═O)—C plane is 77.60 (5)° [C5—C6—C8—O2 torsion angle = -77.75 (12)°], far larger than that [8.64 (5)°; C12—C10—C8—O2 torsion angle = 8.33 (14)°] between the phenyl group and the bridging carbonyl group.
In the crystal, molecules are arranged into (0 1 0) layers via C-H···π interactions (Fig. 2).
For electrophilic aromatic aroylation of the naphthalene core, see: Okamoto & Yonezawa (2009); Okamoto et al. (2011). For the structures of closely related compounds, see: Hijikata et al. (2010); Muto et al. (2010); Nakaema et al. (2008); Watanabe et al. (2010); Sasagawa et al. (2011).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell
PROCESS-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku, 2010); program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C34H36O6 | F(000) = 1152 |
Mr = 540.63 | Dx = 1.228 Mg m−3 |
Orthorhombic, Pbcn | Cu Kα radiation, λ = 1.54187 Å |
Hall symbol: -P 2n 2ab | Cell parameters from 47089 reflections |
a = 11.0930 (2) Å | θ = 3.4–68.2° |
b = 20.0537 (3) Å | µ = 0.67 mm−1 |
c = 13.1409 (2) Å | T = 193 K |
V = 2923.26 (8) Å3 | Block, colorless |
Z = 4 | 0.60 × 0.40 × 0.20 mm |
Rigaku R-AXIS RAPID diffractometer | 2679 independent reflections |
Radiation source: fine-focus sealed tube | 2542 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
Detector resolution: 10.000 pixels mm-1 | θmax = 68.2°, θmin = 4.4° |
ω scans | h = −13→13 |
Absorption correction: numerical (NUMABS; Higashi, 1999) | k = −24→24 |
Tmin = 0.689, Tmax = 0.878 | l = −15→15 |
50625 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.037 | H-atom parameters constrained |
wR(F2) = 0.105 | w = 1/[σ2(Fo2) + (0.0608P)2 + 0.5804P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max < 0.001 |
2679 reflections | Δρmax = 0.27 e Å−3 |
185 parameters | Δρmin = −0.16 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0027 (2) |
C34H36O6 | V = 2923.26 (8) Å3 |
Mr = 540.63 | Z = 4 |
Orthorhombic, Pbcn | Cu Kα radiation |
a = 11.0930 (2) Å | µ = 0.67 mm−1 |
b = 20.0537 (3) Å | T = 193 K |
c = 13.1409 (2) Å | 0.60 × 0.40 × 0.20 mm |
Rigaku R-AXIS RAPID diffractometer | 2679 independent reflections |
Absorption correction: numerical (NUMABS; Higashi, 1999) | 2542 reflections with I > 2σ(I) |
Tmin = 0.689, Tmax = 0.878 | Rint = 0.028 |
50625 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 0 restraints |
wR(F2) = 0.105 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.27 e Å−3 |
2679 reflections | Δρmin = −0.16 e Å−3 |
185 parameters |
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. |
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 | ||
O1 | 0.75396 (7) | 0.21648 (4) | 0.08148 (6) | 0.0440 (2) | |
O2 | 0.54194 (7) | 0.32529 (4) | 0.13838 (6) | 0.0393 (2) | |
O3 | 0.98869 (7) | 0.41391 (4) | 0.40338 (6) | 0.0393 (2) | |
C1 | 0.58364 (10) | 0.07697 (5) | 0.18871 (8) | 0.0412 (3) | |
H1 | 0.5810 | 0.0296 | 0.1871 | 0.049* | |
C2 | 0.66800 (10) | 0.10911 (6) | 0.13181 (9) | 0.0413 (3) | |
H2 | 0.7227 | 0.0847 | 0.0906 | 0.050* | |
C3 | 0.5000 | 0.11152 (7) | 0.2500 | 0.0353 (3) | |
C4 | 0.67285 (10) | 0.17957 (5) | 0.13508 (8) | 0.0357 (3) | |
C5 | 0.5000 | 0.18316 (7) | 0.2500 | 0.0301 (3) | |
C6 | 0.59200 (9) | 0.21598 (5) | 0.19277 (7) | 0.0308 (2) | |
C7 | 0.85144 (11) | 0.18354 (7) | 0.03189 (10) | 0.0516 (3) | |
H7A | 0.8196 | 0.1527 | −0.0193 | 0.062* | |
H7B | 0.8987 | 0.1586 | 0.0822 | 0.062* | |
H7C | 0.9031 | 0.2167 | −0.0013 | 0.062* | |
C8 | 0.60813 (9) | 0.29099 (5) | 0.19033 (7) | 0.0304 (2) | |
C9 | 0.79477 (9) | 0.28188 (5) | 0.29938 (8) | 0.0343 (3) | |
H9 | 0.7888 | 0.2347 | 0.2965 | 0.041* | |
C10 | 0.70756 (9) | 0.32031 (5) | 0.25103 (7) | 0.0303 (2) | |
C11 | 0.89010 (10) | 0.31051 (5) | 0.35162 (8) | 0.0361 (3) | |
H11 | 0.9489 | 0.2833 | 0.3837 | 0.043* | |
C12 | 0.71586 (9) | 0.38984 (5) | 0.25911 (8) | 0.0339 (3) | |
H12 | 0.6561 | 0.4171 | 0.2283 | 0.041* | |
C13 | 0.89867 (9) | 0.37990 (5) | 0.35653 (8) | 0.0335 (2) | |
C14 | 0.80960 (10) | 0.41894 (5) | 0.31120 (8) | 0.0356 (3) | |
H14 | 0.8137 | 0.4661 | 0.3164 | 0.043* | |
C15 | 1.08084 (9) | 0.37643 (5) | 0.45496 (8) | 0.0372 (3) | |
H15A | 1.1186 | 0.3443 | 0.4075 | 0.045* | |
H15B | 1.0454 | 0.3512 | 0.5124 | 0.045* | |
C16 | 1.17371 (10) | 0.42488 (6) | 0.49380 (9) | 0.0426 (3) | |
H16A | 1.1332 | 0.4600 | 0.5342 | 0.051* | |
H16B | 1.2141 | 0.4466 | 0.4354 | 0.051* | |
C17 | 1.26786 (11) | 0.39032 (8) | 0.55954 (10) | 0.0554 (4) | |
H17A | 1.2301 | 0.3767 | 0.6246 | 0.067* | |
H17B | 1.2955 | 0.3494 | 0.5244 | 0.067* | |
C18 | 1.37590 (14) | 0.43398 (11) | 0.58200 (19) | 0.0991 (8) | |
H18A | 1.4270 | 0.4122 | 0.6329 | 0.119* | |
H18B | 1.3484 | 0.4771 | 0.6083 | 0.119* | |
H18C | 1.4222 | 0.4409 | 0.5194 | 0.119* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0409 (4) | 0.0484 (5) | 0.0426 (4) | 0.0008 (3) | 0.0116 (3) | −0.0090 (3) |
O2 | 0.0404 (4) | 0.0392 (4) | 0.0384 (4) | 0.0020 (3) | −0.0056 (3) | 0.0044 (3) |
O3 | 0.0378 (4) | 0.0335 (4) | 0.0464 (5) | −0.0054 (3) | −0.0045 (3) | −0.0031 (3) |
C1 | 0.0504 (7) | 0.0292 (5) | 0.0441 (6) | 0.0062 (4) | −0.0142 (5) | −0.0048 (4) |
C2 | 0.0433 (6) | 0.0391 (6) | 0.0415 (6) | 0.0099 (5) | −0.0049 (5) | −0.0110 (5) |
C3 | 0.0404 (8) | 0.0297 (7) | 0.0357 (7) | 0.000 | −0.0121 (6) | 0.000 |
C4 | 0.0349 (6) | 0.0395 (6) | 0.0326 (5) | 0.0017 (4) | −0.0035 (4) | −0.0062 (4) |
C5 | 0.0314 (7) | 0.0305 (7) | 0.0285 (7) | 0.000 | −0.0068 (5) | 0.000 |
C6 | 0.0313 (5) | 0.0319 (5) | 0.0292 (5) | 0.0001 (4) | −0.0045 (4) | −0.0031 (4) |
C7 | 0.0383 (6) | 0.0677 (8) | 0.0489 (7) | 0.0064 (6) | 0.0056 (5) | −0.0180 (6) |
C8 | 0.0309 (5) | 0.0337 (5) | 0.0266 (5) | 0.0006 (4) | 0.0048 (4) | 0.0007 (4) |
C9 | 0.0373 (5) | 0.0274 (5) | 0.0381 (6) | −0.0016 (4) | −0.0001 (4) | 0.0000 (4) |
C10 | 0.0315 (5) | 0.0310 (5) | 0.0285 (5) | −0.0015 (4) | 0.0046 (4) | 0.0011 (4) |
C11 | 0.0351 (5) | 0.0326 (5) | 0.0406 (6) | 0.0006 (4) | −0.0039 (4) | 0.0012 (4) |
C12 | 0.0359 (5) | 0.0316 (5) | 0.0341 (5) | 0.0012 (4) | 0.0024 (4) | 0.0030 (4) |
C13 | 0.0336 (5) | 0.0338 (5) | 0.0331 (5) | −0.0054 (4) | 0.0037 (4) | −0.0029 (4) |
C14 | 0.0407 (6) | 0.0270 (5) | 0.0392 (6) | −0.0026 (4) | 0.0038 (4) | 0.0005 (4) |
C15 | 0.0344 (5) | 0.0382 (6) | 0.0392 (6) | −0.0016 (4) | 0.0018 (4) | −0.0031 (4) |
C16 | 0.0382 (6) | 0.0439 (6) | 0.0456 (6) | −0.0028 (5) | 0.0004 (5) | −0.0104 (5) |
C17 | 0.0433 (7) | 0.0710 (9) | 0.0520 (7) | 0.0103 (6) | −0.0045 (6) | −0.0159 (6) |
C18 | 0.0470 (8) | 0.1050 (14) | 0.1453 (18) | 0.0234 (9) | −0.0338 (10) | −0.0661 (13) |
O1—C4 | 1.3615 (13) | C9—C10 | 1.3906 (14) |
O1—C7 | 1.4249 (13) | C9—H9 | 0.9500 |
O2—C8 | 1.2159 (12) | C10—C12 | 1.4012 (14) |
O3—C13 | 1.3570 (12) | C11—C13 | 1.3963 (14) |
O3—C15 | 1.4384 (13) | C11—H11 | 0.9500 |
C1—C2 | 1.3602 (16) | C12—C14 | 1.3750 (15) |
C1—C3 | 1.4106 (13) | C12—H12 | 0.9500 |
C1—H1 | 0.9500 | C13—C14 | 1.3942 (15) |
C2—C4 | 1.4146 (16) | C14—H14 | 0.9500 |
C2—H2 | 0.9500 | C15—C16 | 1.5052 (15) |
C3—C1i | 1.4106 (13) | C15—H15A | 0.9900 |
C3—C5 | 1.437 (2) | C15—H15B | 0.9900 |
C4—C6 | 1.3828 (14) | C16—C17 | 1.5222 (17) |
C5—C6 | 1.4284 (12) | C16—H16A | 0.9900 |
C5—C6i | 1.4284 (12) | C16—H16B | 0.9900 |
C6—C8 | 1.5151 (14) | C17—C18 | 1.513 (2) |
C7—H7A | 0.9800 | C17—H17A | 0.9900 |
C7—H7B | 0.9800 | C17—H17B | 0.9900 |
C7—H7C | 0.9800 | C18—H18A | 0.9800 |
C8—C10 | 1.4828 (14) | C18—H18B | 0.9800 |
C9—C11 | 1.3853 (14) | C18—H18C | 0.9800 |
C4—O1—C7 | 119.09 (10) | C9—C11—H11 | 120.4 |
C13—O3—C15 | 118.31 (8) | C13—C11—H11 | 120.4 |
C2—C1—C3 | 122.25 (10) | C14—C12—C10 | 120.65 (10) |
C2—C1—H1 | 118.9 | C14—C12—H12 | 119.7 |
C3—C1—H1 | 118.9 | C10—C12—H12 | 119.7 |
C1—C2—C4 | 118.87 (10) | O3—C13—C14 | 115.67 (9) |
C1—C2—H2 | 120.6 | O3—C13—C11 | 124.88 (10) |
C4—C2—H2 | 120.6 | C14—C13—C11 | 119.45 (9) |
C1i—C3—C1 | 121.15 (13) | C12—C14—C13 | 120.68 (9) |
C1i—C3—C5 | 119.42 (7) | C12—C14—H14 | 119.7 |
C1—C3—C5 | 119.42 (7) | C13—C14—H14 | 119.7 |
O1—C4—C6 | 115.16 (9) | O3—C15—C16 | 108.00 (9) |
O1—C4—C2 | 123.54 (10) | O3—C15—H15A | 110.1 |
C6—C4—C2 | 121.29 (10) | C16—C15—H15A | 110.1 |
C6—C5—C6i | 125.13 (13) | O3—C15—H15B | 110.1 |
C6—C5—C3 | 117.44 (6) | C16—C15—H15B | 110.1 |
C6i—C5—C3 | 117.44 (6) | H15A—C15—H15B | 108.4 |
C4—C6—C5 | 120.58 (10) | C15—C16—C17 | 111.61 (10) |
C4—C6—C8 | 115.85 (9) | C15—C16—H16A | 109.3 |
C5—C6—C8 | 123.57 (9) | C17—C16—H16A | 109.3 |
O1—C7—H7A | 109.5 | C15—C16—H16B | 109.3 |
O1—C7—H7B | 109.5 | C17—C16—H16B | 109.3 |
H7A—C7—H7B | 109.5 | H16A—C16—H16B | 108.0 |
O1—C7—H7C | 109.5 | C18—C17—C16 | 113.00 (14) |
H7A—C7—H7C | 109.5 | C18—C17—H17A | 109.0 |
H7B—C7—H7C | 109.5 | C16—C17—H17A | 109.0 |
O2—C8—C10 | 121.79 (9) | C18—C17—H17B | 109.0 |
O2—C8—C6 | 120.15 (9) | C16—C17—H17B | 109.0 |
C10—C8—C6 | 118.05 (8) | H17A—C17—H17B | 107.8 |
C11—C9—C10 | 121.85 (9) | C17—C18—H18A | 109.5 |
C11—C9—H9 | 119.1 | C17—C18—H18B | 109.5 |
C10—C9—H9 | 119.1 | H18A—C18—H18B | 109.5 |
C9—C10—C12 | 118.11 (9) | C17—C18—H18C | 109.5 |
C9—C10—C8 | 122.92 (9) | H18A—C18—H18C | 109.5 |
C12—C10—C8 | 118.97 (9) | H18B—C18—H18C | 109.5 |
C9—C11—C13 | 119.21 (10) | ||
C3—C1—C2—C4 | 0.70 (15) | C4—C6—C8—C10 | −76.66 (11) |
C2—C1—C3—C1i | −177.57 (11) | C5—C6—C8—C10 | 103.44 (10) |
C2—C1—C3—C5 | 2.43 (11) | C11—C9—C10—C12 | −2.11 (15) |
C7—O1—C4—C6 | 170.91 (9) | C11—C9—C10—C8 | 176.85 (9) |
C7—O1—C4—C2 | −10.34 (15) | O2—C8—C10—C9 | −170.62 (9) |
C1—C2—C4—O1 | 179.73 (9) | C6—C8—C10—C9 | 8.16 (14) |
C1—C2—C4—C6 | −1.59 (16) | O2—C8—C10—C12 | 8.33 (14) |
C1i—C3—C5—C6 | 175.43 (7) | C6—C8—C10—C12 | −172.88 (9) |
C1—C3—C5—C6 | −4.57 (7) | C10—C9—C11—C13 | 0.42 (16) |
C1i—C3—C5—C6i | −4.57 (7) | C9—C10—C12—C14 | 1.70 (15) |
C1—C3—C5—C6i | 175.43 (7) | C8—C10—C12—C14 | −177.30 (9) |
O1—C4—C6—C5 | 178.06 (7) | C15—O3—C13—C14 | 177.64 (9) |
C2—C4—C6—C5 | −0.73 (14) | C15—O3—C13—C11 | −2.08 (14) |
O1—C4—C6—C8 | −1.84 (13) | C9—C11—C13—O3 | −178.58 (9) |
C2—C4—C6—C8 | 179.37 (9) | C9—C11—C13—C14 | 1.70 (15) |
C6i—C5—C6—C4 | −176.24 (10) | C10—C12—C14—C13 | 0.38 (15) |
C3—C5—C6—C4 | 3.76 (10) | O3—C13—C14—C12 | 178.15 (9) |
C6i—C5—C6—C8 | 3.65 (7) | C11—C13—C14—C12 | −2.11 (15) |
C3—C5—C6—C8 | −176.35 (7) | C13—O3—C15—C16 | 176.09 (9) |
C4—C6—C8—O2 | 102.15 (11) | O3—C15—C16—C17 | 173.78 (9) |
C5—C6—C8—O2 | −77.75 (12) | C15—C16—C17—C18 | 168.20 (12) |
Symmetry code: (i) −x+1, y, −z+1/2. |
Cg is the centroid of the C9–C14 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7A···Cgii | 0.98 | 2.68 | 3.5056 (14) | 142 |
Symmetry code: (ii) −x+3/2, −y+1/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C34H36O6 |
Mr | 540.63 |
Crystal system, space group | Orthorhombic, Pbcn |
Temperature (K) | 193 |
a, b, c (Å) | 11.0930 (2), 20.0537 (3), 13.1409 (2) |
V (Å3) | 2923.26 (8) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 0.67 |
Crystal size (mm) | 0.60 × 0.40 × 0.20 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Numerical (NUMABS; Higashi, 1999) |
Tmin, Tmax | 0.689, 0.878 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 50625, 2679, 2542 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.602 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.105, 1.04 |
No. of reflections | 2679 |
No. of parameters | 185 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.27, −0.16 |
Computer programs: PROCESS-AUTO (Rigaku, 1998), CrystalStructure (Rigaku, 2010), SIR2004 (Burla et al., 2005), SHELXL97 (Sheldrick, 2008), ORTEPIII (Burnett & Johnson, 1996).
Cg is the centroid of the C9–C14 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7A···Cgi | 0.98 | 2.68 | 3.5056 (14) | 142 |
Symmetry code: (i) −x+3/2, −y+1/2, z−1/2. |
Acknowledgements
The authors express their gratitude to Master Daichi Hijikata, Department of Organic and Polymer Materials Chemistry, Graduate School, Tokyo University of Agriculture & Technology, and Professor Keiichi Noguchi, Instrumentation Analysis Center, Tokyo University of Agriculture and Technology, for their technical advice.
References
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In the course of our study on electrophilic aromatic aroylation of the naphthalene core, 1,8-diaroylnaphthalene compounds have proved to be formed regioselectively by the aid of a suitable acidic mediator (Okamoto & Yonezawa, 2009, Okamoto et al., 2011). Recently, we have reported the X-ray crystal structures of 1,8-diaroylated 2,7-dimethoxynaphthalene derivatives such as 1,8-dibenzoyl-2,7-dimethoxynaphthalene (Nakaema et al., 2008), (2,7-dimethoxynaphthalene-1,8-diyl)bis(4-fluorophenyl)dimethanone [1,8-bis(4-fluorobenzoyl)-2,7-dimethoxynaphthalene] (Watanabe, Nagasawa et al., 2010), 1,8-bis(4-methylbenzoyl)-2,7-dimethoxynaphthalene (Muto et al., 2010), and {8-[4-(bromomethyl)benzoyl]-2,7-dimethoxynaphthalen-1-yl}[4-(bromomethyl)phenyl]methanone [1,8-bis(4-bromomethylbenzoyl)-2,7-dimethoxynaphthalene] (Sasagawa et al., 2011). The aroyl groups in these compounds are perpendicularly attached to the naphthalene rings and oriented in opposite directions. On the other hand, X-ray structure of 2,7-dimethoxy-1,8-bis(4-phenoxybenzoyl)naphthalene (Hijikata et al., 2010) having the aroyl groups oriented in the same directions has been also revealed. As a part of our ongoing studies on the molecular structures of this kind of homologous molecules, the X-ray crystal structure of title compound, 1,8-diaroylnaphthalene bearing butoxy groups, is discussed in this article.
The molecular structure of the title compound is displayed in Fig 1. The molecule of (I) lies on a crystallographic 2-fold axis so that the asymmetric unit contains one-half of the molecule. Thus, two 4-butoxybenzoyl groups are situated in anti orientation and are twisted away from the attached naphthalene ring. The dihedral angle between the best planes of the 4-butoxyphenyl groups and the naphthalene ring system is 71.70 (4)°.
The dihedral between the naphthalene ring system and the bridging carbonyl C—C(═O)—C plane is 77.60 (5)° [C5—C6—C8—O2 torsion angle = -77.75 (12)°], far larger than that [8.64 (5)°; C12—C10—C8—O2 torsion angle = 8.33 (14)°] between the phenyl group and the bridging carbonyl group.
In the crystal, molecules are arranged into (0 1 0) layers via C-H···π interactions (Fig. 2).