2-(4-Chloro­benzo­yl)-3,6-dimethoxy­naphthalene

Nakaema, K.; Okamoto, A.; Imaizumi, M.; Noguchi, K.; Yonezawa, N.

doi:10.1107/S1600536808004704

organic compounds

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ISSN: 2056-9890

Volume 64| Part 3| March 2008| Page o612

doi:10.1107/S1600536808004704

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2-(4-Chlorobenzoyl)-3,6-dimethoxynaphthalene

Kosuke Nakaema,^a Akiko Okamoto,^a Masahiro Imaizumi,^b Keiichi Noguchi ^c and Noriyuki Yonezawa ^a ^*

^aDepartment of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture & Technology, Koganei, Tokyo 184-8588, Japan, ^bSection Manager, Group I, Section III, Functional Chemicals Research Laboratory, Nippon Kayaku Co. Ltd, Shimo 3-chome, Kita-ku, Tokyo 115-0042, Japan, and ^cInstrumentation Analysis Center, Tokyo University of Agriculture & Technology, Koganei, Tokyo 184-8588, Japan
^*Correspondence e-mail: yonezawa@cc.tuat.ac.jp

(Received 16 February 2008; accepted 18 February 2008; online 22 February 2008)

In the title compound, C₁₉H₁₅ClO₃, the interplanar angle between the naphthalene and benzene ring systems is 62.67 (6)°. The carbonyl group is twisted from both ring planes, with torsion angles of −44.9 (2)° with respect to the naphthalene ring and −26.7 (2)° with respect to the phenylene ring. There is an intermolecular hydrogen bond between an H atom of one methoxy group and the O atom of the second methoxy group, forming chains along the ac diagonal.

Related literature

For related literature, see: Ahn et al. (2003 ); Allen et al. (1998 ); Chen et al. (2005 ); Crasto & Stevens (1998 , 2002 ); Lorenzetti et al. (2005 ); Nakaema et al. (2007 ); Su et al. (2004 ); Wang & Guen (1995 ).

Experimental

Crystal data

C₁₉H₁₅ClO₃
M_r = 326.76
Monoclinic, P 2₁ /c
a = 8.1894 (5) Å
b = 20.5251 (13) Å
c = 9.9098 (7) Å
β = 106.358 (4)°
V = 1598.29 (18) Å³
Z = 4
Cu Kα radiation
μ = 2.22 mm⁻¹
T = 296 K
0.50 × 0.25 × 0.10 mm

Data collection

Rigaku R-AXIS RAPID diffractometer
Absorption correction: numerical (NUMABS; Higashi, 1999 ) T_min = 0.458, T_max = 0.801
30087 measured reflections
2917 independent reflections
2652 reflections with I > 2σ(I)
R_int = 0.049

Refinement

R[F² > 2σ(F²)] = 0.033
wR(F²) = 0.100
S = 1.07
2917 reflections
211 parameters
H-atom parameters constrained
Δρ_max = 0.17 e Å⁻³
Δρ_min = −0.28 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C18—H18C⋯O3ⁱ	0.96	2.51	3.460 (2)	171
Symmetry code: (i) x-1, y, z-1.

Data collection: PROCESS-AUTO (Rigaku, 1998 ); cell refinement: PROCESS-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2004 ); program(s) used to solve structure: SIR92 (Altomare et al., 1994 ); 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

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808004704/fl2189sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808004704/fl2189Isup2.hkl

checkCIF report

Comment top

Naphthalene derivatives, such as 1,5-disubstituted and 2,6-disubstituted naphthalenes, have been used widely as key building blocks of functional organic compounds such as liquid crystals and electric materials (Su et al., 2004; Ahn et al., 2003; Lorenzetti et al., 2005; Chen et al., 2005). Recently, 1,8-disubstituted naphthalenes have received much attention as unique structured aromatic core compounds, exemplified by dendron cores and supramolecular building blocks (Wang & Guen, 1995; Allen et al., 1998; Crasto & Stevens, 1998, 2002).

In this paper, the structural characteristics of the title compound, which is one of the products of electrophilic aromatic aroylation of 2,7-dimethoxynaphthalene, is reported and discussed. The authors have recently reported the crystal structure of the 1,8-diaroylated derivative of 2,7-dimethoxynaphthalene as the product of regioselective electrophilic aromatic aroylation of 2,7-dimethoxynaphthalene with 4-chlorobenzoic acid (Nakaema et al., 2007). As 3-substituted naphthalene compounds are generally regarded to be thermodynamically more stable than the corresponding 1-positioned isomeric molecules, the title molecule is of interest from both the stereochemical features of its conformation and the thermodynamic aspects of its molecular structure.

An ORTEPIII (Burnett & Johnson, 1996) plot of the title molecule, (I), is displayed in Fig. 1. The 4-chlorobenzoyl group is twisted away from the attached naphthalene ring. The interplanar angle between the best planes of the chlorophenyl ring and the naphthalene ring is 62.67 (6)°. The torsion angle between the carbonyl group and the naphthalene ring is relatively large [C4—C3—C11—O1 = -44.9 (2)°] and that between 4-chlorophenyl group and carbonyl group is rather small [O1—C11—C12—C13 = -26.7 (2)°].

The crystal packing is stabilized mainly by van der Waals interactions. In addition, there is a C—H···O hydrogen bond between a hydrogen of the 2-methoxy group which is situated adjacent to the chlorobenzoyl group, and the ethereal oxygen of the 7-methoxy group in a neighboring molecule that could also contribute the stabilization of the crystal packing (Table 1, Figure 2).

Related literature top

For related literature, see: Ahn et al. (2003); Allen et al. (1998); Chen et al. (2005); Crasto & Stevens (1998, 2002); Lorenzetti et al. (2005); Nakaema et al. (2007); Su et al. (2004); Wang & Guen (1995).

Experimental top

The title compound was prepared by electrophilic aromatic aroylation reaction of 2,7-dimethoxynaphthalene with 4-chlorobenzoic acid. Yellow single crystals suitable for X-ray diffraction were obtained by recrystallization from ethanol and ethyl acetate.

Computing details top

Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SIR92 (Altomare et al., 1994); 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).

Figures top

	Fig. 1. Molecular structure of (I), with the atom-labeling scheme and displacement ellipsoids drawn at the 50% probability level.
	Fig. 2. A partial packing diagram of the title compound, viewed down the c axis. The dashed lines indicate hydrogen bonds.

2-(4-Chlorobenzoyl)-3,6-dimethoxynaphthalene top

Crystal data top

C₁₉H₁₅ClO₃	F(000) = 680
M_r = 326.76	D_x = 1.358 Mg m⁻³
Monoclinic, P2₁/c	Melting point = 424.8–425.2 K
Hall symbol: -P 2ybc	Cu Kα radiation, λ = 1.54187 Å
a = 8.1894 (5) Å	Cell parameters from 28831 reflections
b = 20.5251 (13) Å	θ = 4.3–68.2°
c = 9.9098 (7) Å	µ = 2.22 mm⁻¹
β = 106.358 (4)°	T = 296 K
V = 1598.29 (18) Å³	Platelet, colorless
Z = 4	0.50 × 0.25 × 0.10 mm

Data collection top

Rigaku R-AXIS RAPID diffractometer	2917 independent reflections
Radiation source: rotating anode	2652 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.049
Detector resolution: 10.00 pixels mm^-1	θ_max = 68.2°, θ_min = 4.3°
ω scans	h = −9→9
Absorption correction: numerical (NUMABS; Higashi, 1999)	k = −24→24
T_min = 0.458, T_max = 0.801	l = −11→11
30087 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: difference Fourier map
R[F² > 2σ(F²)] = 0.033	H-atom parameters constrained
wR(F²) = 0.100	w = 1/[σ²(F_o²) + (0.054P)² + 0.2906P] where P = (F_o² + 2F_c²)/3
S = 1.07	(Δ/σ)_max < 0.001
2917 reflections	Δρ_max = 0.17 e Å⁻³
211 parameters	Δρ_min = −0.28 e Å⁻³
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 1997), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0039 (4)

Crystal data top

C₁₉H₁₅ClO₃	V = 1598.29 (18) Å³
M_r = 326.76	Z = 4
Monoclinic, P2₁/c	Cu Kα radiation
a = 8.1894 (5) Å	µ = 2.22 mm⁻¹
b = 20.5251 (13) Å	T = 296 K
c = 9.9098 (7) Å	0.50 × 0.25 × 0.10 mm
β = 106.358 (4)°

Data collection top

Rigaku R-AXIS RAPID diffractometer	2917 independent reflections
Absorption correction: numerical (NUMABS; Higashi, 1999)	2652 reflections with I > 2σ(I)
T_min = 0.458, T_max = 0.801	R_int = 0.049
30087 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.033	0 restraints
wR(F²) = 0.100	H-atom parameters constrained
S = 1.07	Δρ_max = 0.17 e Å⁻³
2917 reflections	Δρ_min = −0.28 e Å⁻³
211 parameters

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Cl1	−0.25848 (6)	0.44273 (2)	−0.48382 (4)	0.06829 (17)
O1	−0.25367 (15)	0.47599 (6)	0.18888 (12)	0.0662 (3)
O2	−0.21482 (13)	0.30244 (5)	0.06521 (11)	0.0560 (3)
O3	0.44684 (14)	0.21975 (6)	0.70829 (12)	0.0662 (3)
C1	0.01126 (17)	0.27069 (7)	0.26978 (14)	0.0452 (3)
H1	0.0024	0.2272	0.2421	0.054*
C2	−0.09091 (17)	0.31627 (7)	0.18563 (14)	0.0439 (3)
C3	−0.07602 (17)	0.38337 (7)	0.22433 (14)	0.0441 (3)
C4	0.03617 (18)	0.40089 (7)	0.35010 (15)	0.0478 (3)
H4	0.0430	0.4444	0.3770	0.057*
C5	0.14146 (17)	0.35510 (7)	0.44000 (14)	0.0457 (3)
C6	0.2559 (2)	0.37226 (8)	0.57153 (17)	0.0573 (4)
H6	0.2642	0.4155	0.6006	0.069*
C7	0.3536 (2)	0.32631 (8)	0.65574 (17)	0.0602 (4)
H7	0.4280	0.3384	0.7416	0.072*
C8	0.34269 (17)	0.26071 (8)	0.61388 (15)	0.0515 (4)
C9	0.23401 (16)	0.24175 (7)	0.48760 (15)	0.0475 (3)
H9	0.2284	0.1982	0.4606	0.057*
C10	0.13031 (16)	0.28874 (7)	0.39836 (14)	0.0427 (3)
C11	−0.18305 (18)	0.43524 (7)	0.13539 (15)	0.0474 (3)
C12	−0.19823 (17)	0.43754 (6)	−0.01795 (15)	0.0446 (3)
C13	−0.34026 (19)	0.46603 (8)	−0.11003 (16)	0.0559 (4)
H13	−0.4242	0.4839	−0.0747	0.067*
C14	−0.3593 (2)	0.46831 (8)	−0.25247 (17)	0.0579 (4)
H14	−0.4556	0.4870	−0.3132	0.070*
C15	−0.2335 (2)	0.44241 (6)	−0.30339 (15)	0.0498 (3)
C16	−0.0880 (2)	0.41601 (8)	−0.21476 (16)	0.0561 (4)
H16	−0.0017	0.4004	−0.2502	0.067*
C17	−0.07217 (19)	0.41313 (7)	−0.07204 (16)	0.0527 (4)
H17	0.0246	0.3945	−0.0116	0.063*
C18	−0.2507 (2)	0.23549 (8)	0.03027 (17)	0.0576 (4)
H18A	−0.2803	0.2140	0.1061	0.086*
H18B	−0.1519	0.2151	0.0149	0.086*
H18C	−0.3439	0.2324	−0.0537	0.086*
C19	0.4318 (2)	0.15190 (9)	0.6806 (2)	0.0759 (5)
H19A	0.4573	0.1429	0.5936	0.114*
H19B	0.3178	0.1381	0.6738	0.114*
H19C	0.5102	0.1288	0.7556	0.114*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cl1	0.1005 (4)	0.0595 (3)	0.0412 (2)	0.0008 (2)	0.0139 (2)	0.00090 (15)
O1	0.0758 (7)	0.0705 (7)	0.0523 (6)	0.0258 (6)	0.0178 (5)	0.0004 (5)
O2	0.0605 (6)	0.0511 (6)	0.0437 (5)	−0.0009 (5)	−0.0059 (5)	0.0007 (4)
O3	0.0597 (6)	0.0702 (7)	0.0541 (7)	0.0035 (5)	−0.0078 (5)	0.0142 (5)
C1	0.0489 (7)	0.0428 (7)	0.0405 (7)	−0.0011 (5)	0.0070 (6)	−0.0004 (5)
C2	0.0440 (7)	0.0491 (7)	0.0355 (7)	−0.0019 (5)	0.0063 (5)	0.0004 (5)
C3	0.0458 (7)	0.0467 (7)	0.0385 (7)	0.0014 (5)	0.0099 (6)	0.0039 (5)
C4	0.0523 (8)	0.0437 (7)	0.0454 (8)	−0.0030 (6)	0.0105 (6)	0.0002 (6)
C5	0.0450 (7)	0.0489 (7)	0.0407 (7)	−0.0052 (6)	0.0079 (6)	0.0018 (6)
C6	0.0609 (9)	0.0543 (8)	0.0480 (8)	−0.0101 (7)	0.0014 (7)	−0.0023 (7)
C7	0.0586 (9)	0.0664 (10)	0.0442 (8)	−0.0109 (7)	−0.0039 (7)	0.0006 (7)
C8	0.0436 (7)	0.0621 (9)	0.0439 (8)	−0.0021 (6)	0.0044 (6)	0.0109 (6)
C9	0.0458 (7)	0.0495 (8)	0.0442 (8)	−0.0006 (6)	0.0077 (6)	0.0047 (6)
C10	0.0401 (6)	0.0487 (7)	0.0381 (7)	−0.0029 (5)	0.0090 (5)	0.0035 (5)
C11	0.0468 (7)	0.0472 (7)	0.0467 (8)	0.0045 (6)	0.0106 (6)	0.0016 (6)
C12	0.0474 (7)	0.0405 (7)	0.0443 (8)	0.0040 (5)	0.0101 (6)	0.0039 (5)
C13	0.0526 (8)	0.0628 (9)	0.0504 (9)	0.0167 (7)	0.0117 (7)	0.0064 (7)
C14	0.0561 (8)	0.0608 (9)	0.0497 (9)	0.0109 (7)	0.0033 (7)	0.0088 (7)
C15	0.0652 (9)	0.0395 (7)	0.0417 (8)	−0.0021 (6)	0.0102 (6)	0.0031 (5)
C16	0.0638 (9)	0.0562 (8)	0.0516 (9)	0.0124 (7)	0.0218 (7)	0.0063 (7)
C17	0.0501 (7)	0.0569 (8)	0.0491 (8)	0.0138 (6)	0.0109 (6)	0.0100 (7)
C18	0.0579 (9)	0.0551 (9)	0.0509 (9)	−0.0030 (7)	0.0007 (7)	−0.0085 (7)
C19	0.0724 (11)	0.0675 (11)	0.0721 (12)	0.0099 (9)	−0.0050 (9)	0.0169 (9)

Geometric parameters (Å, º) top

Cl1—C15	1.7415 (15)	C8—C9	1.372 (2)
O1—C11	1.2196 (18)	C9—C10	1.4180 (19)
O2—C2	1.3610 (16)	C9—H9	0.9300
O2—C18	1.4273 (18)	C11—C12	1.490 (2)
O3—C8	1.3638 (17)	C12—C17	1.384 (2)
O3—C19	1.418 (2)	C12—C13	1.3891 (19)
C1—C2	1.3703 (19)	C13—C14	1.377 (2)
C1—C10	1.4184 (18)	C13—H13	0.9300
C1—H1	0.9300	C14—C15	1.376 (2)
C2—C3	1.425 (2)	C14—H14	0.9300
C3—C4	1.3718 (19)	C15—C16	1.377 (2)
C3—C11	1.4980 (18)	C16—C17	1.385 (2)
C4—C5	1.4098 (19)	C16—H16	0.9300
C4—H4	0.9300	C17—H17	0.9300
C5—C10	1.419 (2)	C18—H18A	0.9600
C5—C6	1.419 (2)	C18—H18B	0.9600
C6—C7	1.360 (2)	C18—H18C	0.9600
C6—H6	0.9300	C19—H19A	0.9600
C7—C8	1.404 (2)	C19—H19B	0.9600
C7—H7	0.9300	C19—H19C	0.9600

C2—O2—C18	117.72 (11)	O1—C11—C3	120.14 (13)
C8—O3—C19	117.97 (13)	C12—C11—C3	119.31 (12)
C2—C1—C10	121.05 (13)	C17—C12—C13	118.41 (13)
C2—C1—H1	119.5	C17—C12—C11	121.76 (12)
C10—C1—H1	119.5	C13—C12—C11	119.81 (13)
O2—C2—C1	124.60 (12)	C14—C13—C12	121.32 (14)
O2—C2—C3	115.07 (11)	C14—C13—H13	119.3
C1—C2—C3	120.30 (12)	C12—C13—H13	119.3
C4—C3—C2	118.85 (12)	C15—C14—C13	118.88 (14)
C4—C3—C11	118.65 (13)	C15—C14—H14	120.6
C2—C3—C11	122.47 (12)	C13—C14—H14	120.6
C3—C4—C5	122.22 (13)	C14—C15—C16	121.41 (14)
C3—C4—H4	118.9	C14—C15—Cl1	119.44 (12)
C5—C4—H4	118.9	C16—C15—Cl1	119.15 (12)
C4—C5—C10	118.58 (12)	C15—C16—C17	118.92 (14)
C4—C5—C6	122.91 (13)	C15—C16—H16	120.5
C10—C5—C6	118.50 (13)	C17—C16—H16	120.5
C7—C6—C5	120.92 (15)	C12—C17—C16	120.98 (13)
C7—C6—H6	119.5	C12—C17—H17	119.5
C5—C6—H6	119.5	C16—C17—H17	119.5
C6—C7—C8	120.41 (14)	O2—C18—H18A	109.5
C6—C7—H7	119.8	O2—C18—H18B	109.5
C8—C7—H7	119.8	H18A—C18—H18B	109.5
O3—C8—C9	124.79 (15)	O2—C18—H18C	109.5
O3—C8—C7	114.39 (13)	H18A—C18—H18C	109.5
C9—C8—C7	120.82 (13)	H18B—C18—H18C	109.5
C8—C9—C10	119.77 (14)	O3—C19—H19A	109.5
C8—C9—H9	120.1	O3—C19—H19B	109.5
C10—C9—H9	120.1	H19A—C19—H19B	109.5
C9—C10—C1	121.47 (13)	O3—C19—H19C	109.5
C9—C10—C5	119.58 (12)	H19A—C19—H19C	109.5
C1—C10—C5	118.93 (12)	H19B—C19—H19C	109.5
O1—C11—C12	120.53 (13)

C18—O2—C2—C1	5.6 (2)	C2—C1—C10—C5	0.6 (2)
C18—O2—C2—C3	−172.22 (13)	C4—C5—C10—C9	−179.51 (12)
C10—C1—C2—O2	−175.97 (12)	C6—C5—C10—C9	−0.7 (2)
C10—C1—C2—C3	1.7 (2)	C4—C5—C10—C1	−1.44 (19)
O2—C2—C3—C4	174.76 (12)	C6—C5—C10—C1	177.42 (13)
C1—C2—C3—C4	−3.1 (2)	C4—C3—C11—O1	−44.9 (2)
O2—C2—C3—C11	−2.86 (19)	C2—C3—C11—O1	132.68 (15)
C1—C2—C3—C11	179.26 (13)	C4—C3—C11—C12	133.39 (14)
C2—C3—C4—C5	2.3 (2)	C2—C3—C11—C12	−48.98 (19)
C11—C3—C4—C5	179.99 (13)	O1—C11—C12—C17	151.86 (15)
C3—C4—C5—C10	0.0 (2)	C3—C11—C12—C17	−26.5 (2)
C3—C4—C5—C6	−178.83 (14)	O1—C11—C12—C13	−26.7 (2)
C4—C5—C6—C7	179.15 (15)	C3—C11—C12—C13	154.93 (14)
C10—C5—C6—C7	0.3 (2)	C17—C12—C13—C14	2.1 (2)
C5—C6—C7—C8	−0.1 (3)	C11—C12—C13—C14	−179.24 (14)
C19—O3—C8—C9	−5.8 (2)	C12—C13—C14—C15	−0.8 (3)
C19—O3—C8—C7	173.98 (16)	C13—C14—C15—C16	−1.7 (2)
C6—C7—C8—O3	−179.71 (15)	C13—C14—C15—Cl1	178.11 (13)
C6—C7—C8—C9	0.1 (2)	C14—C15—C16—C17	2.8 (2)
O3—C8—C9—C10	179.38 (13)	Cl1—C15—C16—C17	−177.04 (12)
C7—C8—C9—C10	−0.4 (2)	C13—C12—C17—C16	−1.0 (2)
C8—C9—C10—C1	−177.32 (13)	C11—C12—C17—C16	−179.62 (14)
C8—C9—C10—C5	0.7 (2)	C15—C16—C17—C12	−1.4 (2)
C2—C1—C10—C9	178.63 (13)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C18—H18C···O3ⁱ	0.96	2.51	3.460 (2)	171

Symmetry code: (i) x−1, y, z−1.

Experimental details

Crystal data
Chemical formula	C₁₉H₁₅ClO₃
M_r	326.76
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	296
a, b, c (Å)	8.1894 (5), 20.5251 (13), 9.9098 (7)
β (°)	106.358 (4)
V (Å³)	1598.29 (18)
Z	4
Radiation type	Cu Kα
µ (mm⁻¹)	2.22
Crystal size (mm)	0.50 × 0.25 × 0.10

Data collection
Diffractometer	Rigaku R-AXIS RAPID diffractometer
Absorption correction	Numerical (NUMABS; Higashi, 1999)
T_min, T_max	0.458, 0.801
No. of measured, independent and observed [I > 2σ(I)] reflections	30087, 2917, 2652
R_int	0.049
(sin θ/λ)_max (Å⁻¹)	0.602

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.033, 0.100, 1.07
No. of reflections	2917
No. of parameters	211
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.17, −0.28

Computer programs: PROCESS-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2004), SIR92 (Altomare et al., 1994), SHELXL97 (Sheldrick, 2008), ORTEPIII (Burnett & Johnson, 1996).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C18—H18C···O3ⁱ	0.96	2.51	3.460 (2)	171

Symmetry code: (i) x−1, y, z−1.

Acknowledgements

This work was partially supported by the Ogasawara Foundation for the Promotion of Science & Engineering, Tokyo, Japan.

References

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