organic compounds
(4-Bromophenyl)(3,6-dimethoxy-2-naphthyl)methanone
aDepartment of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-machi, Koganei, Tokyo 184-8588, Japan
*Correspondence e-mail: yonezawa@cc.tuat.ac.jp
In the title compound, C19H15BrO3, the dihedral angle between the naphthalene ring system and the benzene ring is 62.51 (8)°. The bridging carbonyl C—C(=O)—C plane makes dihedral angles of 47.07 (6)° with the naphthalene ring system and 24.20 (10)° with the benzene ring. A weak intermolecular C—H⋯O hydrogen bond exists between the H atom of one methoxy group and the O atom of the other methoxy group in an adjacent molecule. The crystal packing is additionally stabilized by two types of weak intermolecular interactions involving the Br atom, C—H⋯Br and Br⋯O [3.2802 (14) Å].
Related literature
For electrophilic aromatic substitution of naphthalene derivatives affording peri-aroylated compounds regioselectively, see: Okamoto & Yonezawa (2009). For the structures of closely related compounds, see: Kato et al. (2010); Muto et al. (2010); Nakaema et al. (2008); Watanabe et al. (2010a,b).
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/MSC, 2004); 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/S160053681004016X/vm2049sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681004016X/vm2049Isup2.hkl
The title compound was prepared by treatment of a mixture of 2,7-dimethoxynaphthalene (1.88 g, 10 mmol) and 4-bromobenzoic acid (2.02 g, 10 mmol) with phosphorus pentoxide–methanesulfonic acid mixture (P2O5–MsOH [1/10 w/w]; 10 mL). After the reaction mixture was stirred at 353 K for 8 hours, the mixture was poured into ice-cooled water and extracted with CHCl3 (10 ml × 3). The combined extracts were washed with 2 M aqueous NaOH followed by washing with brine. The organic layer thus obtained was dried over anhydrous MgSO4. The solvent was removed under reduced pressure to give a cake (yield 3.07 g, 83%). The crude product was purified by flush silica gel
(CHCl3). Colorless platelet single crystals suitable for X-ray diffraction were obtained by crystallization from ethanol and chloroform.Spectroscopic Data:
1H NMR (300 MHz, CDCl3) δ 3.81 (3H, s), 3.93 (3H, s), 7.03 (1H, dd, 9.0 Hz), 7.09 (1H, d, J = 2.4 Hz), 7.12 (1H, s), 7.56 (2H, d, J = 8.4 Hz), 7.67-7.71 (3H, m), 7.78 (1H, s).
13C NMR (75 MHz, CDCl3) δ 55.32, 55.49, 105.01, 105.42, 117.16, 123.18, 127.32, 127.92, 130.05, 130.25, 131.30, 131.46, 136.96, 137.28, 155.64, 159.45, 194.94.
IR (KBr): 1626, 1585, 1501, 1134 cm-1.
HRMS (m/z): [M + H]+ calcd for C19H16BrO3, 371.0283; found, 371.0298.
All H atoms were found in a difference map and were subsequently refined as riding atoms, with C–H = 0.93 (aromatic) and 0.96 (methyl) Å, and with Uiso(H) = 1.2Ueq(C).
In the course of our study on selective electrophilic aromatic aroylation of 2,7-dimethoxynaphthalene, peri-aroylnaphthalene compounds have proved to be formed regioselectively with the aid of suitable acidic mediator (Okamoto & Yonezawa, 2009). Recently, we reported the structures of 1,8-diaroyl-2,7-dimethoxynaphthalenes, i. e., 1,8-bis(4-methylbenzoyl)-2,7-dimethoxynaphthalene (Muto et al., 2010), bis(4-bromophenyl)(2,7-dimethoxynaphthalene-1,8-diyl)dimethanone (Watanabe et al., 2010a), and 1-aroyl-2,7-dimethoxynaphthalene, i. e., 1-benzoyl-2,7-dimethoxynaphthalene (Kato et al., 2010). The aroyl groups at the 1,8-positions of the naphthalene rings in these compounds are twistedly bonded in a perpendicular manner but the benzene ring moieties of the aroyl groups tilt slightly toward the exo sides of the naphthalene rings. 1-Aroyl homologues also revealed essentially the same non-coplanar structure as observed for 1,8-diaroylated naphthalenes.
Furthermore, we also reported the β-isomers of 3-aroyl-2,7-dimethoxynaphthalenes such as 2-(4-chlorobenzoyl)-3,6-dimethoxynaphthalene (Nakaema et al., 2008) and (3,6-dimethoxy-2-naphthyl)(4-fluorophenyl)methanone (Watanabe et al., 2010b). In these 3-aroylated naphthalenes, which are generally regarded to be thermodynamically more stable than the corresponding 1-positioned isomeric molecules, the aroyl groups are shown connected to the naphthalene rings in a moderately twisted fashion. As part of our ongoing study on these homologous molecules, the synthesis and of the title compound, a 3-monoaroylnaphthalene bearing a bromo group, is discussed in this article. The title compound was prepared by a direct condensation reaction of 2,7-dimethoxynaphthalene with 4-bromobenzoic acid.
analysis of the correspondingThe molecular structure of the title molecule is displayed in Fig. 1. The 4-bromophenyl group is bonded twistedly away from the attached naphthalene ring. The dihedral angle between the best planes of the bromophenyl ring (C12—C17) and the naphthalene ring (C1—C10) is 62.51 (8)°. The bridging carbonyl plane (O3—C6—C11—C12) makes a relatively large dihedral angle of 47.07 (9)° with the naphthalene ring (C1—C10) [C5—C6—C11—O3 torsion angle = 46.0 (2)°], whereas it makes a rather small angle of 24.20 (10)° with 4-bromophenyl ring (C12—C17) [O3—C11—C12—C17 torsion angle = 24.1 (3)°].
In the
the molecular packing of the title compound is stabilized mainly by van der Waals interactions. Moreover, there is a C—H···O hydrogen bond between a hydrogen of the 2-methoxy group, which is situated adjacent to the bromophenyl group, and the ethereal oxygen atom of the 7-methoxy group in the neighboring molecule (Table 1, Fig. 2).The crystal packing is additionally stabilized by two types of weak intermolecular interactions with the bromine atom: Br1···O3i = 3.2802 (14) Å, and Br1···H5ii = 2.98 Å [symmetry operations: (i) x, y, z + 1, (ii) -x, -y, -z] (Fig. 3) .
For electrophilic aromatic substitution of naphthalene derivatives affording peri-aroylated compounds regioselectively, see: Okamoto & Yonezawa (2009). For the structures of closely related compounds, see: Kato et al. (2010); Muto et al. (2010); Nakaema et al. (2008); Watanabe et al. (2010a,b).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell
PROCESS-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2004); 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).C19H15BrO3 | F(000) = 752 |
Mr = 371.22 | Dx = 1.537 Mg m−3 |
Monoclinic, P21/c | Melting point = 416.9–419.5 K |
Hall symbol: -P 2ybc | Cu Kα radiation, λ = 1.54187 Å |
a = 7.88917 (14) Å | Cell parameters from 26572 reflections |
b = 21.0182 (4) Å | θ = 4.2–68.3° |
c = 10.06272 (18) Å | µ = 3.60 mm−1 |
β = 105.971 (1)° | T = 193 K |
V = 1604.16 (5) Å3 | Platelet, colorless |
Z = 4 | 0.60 × 0.40 × 0.20 mm |
Rigaku R-AXIS RAPID diffractometer | 2934 independent reflections |
Radiation source: rotating anode | 2767 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.044 |
Detector resolution: 10.00 pixels mm-1 | θmax = 68.3°, θmin = 4.2° |
ω scans | h = −9→9 |
Absorption correction: numerical (NUMABS; Higashi, 1999) | k = −25→25 |
Tmin = 0.161, Tmax = 0.533 | l = −12→12 |
29541 measured reflections |
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)] = 0.032 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.12 | w = 1/[σ2(Fo2) + (0.0497P)2 + 0.6344P] where P = (Fo2 + 2Fc2)/3 |
2934 reflections | (Δ/σ)max < 0.001 |
210 parameters | Δρmax = 0.43 e Å−3 |
0 restraints | Δρmin = −1.03 e Å−3 |
C19H15BrO3 | V = 1604.16 (5) Å3 |
Mr = 371.22 | Z = 4 |
Monoclinic, P21/c | Cu Kα radiation |
a = 7.88917 (14) Å | µ = 3.60 mm−1 |
b = 21.0182 (4) Å | T = 193 K |
c = 10.06272 (18) Å | 0.60 × 0.40 × 0.20 mm |
β = 105.971 (1)° |
Rigaku R-AXIS RAPID diffractometer | 2934 independent reflections |
Absorption correction: numerical (NUMABS; Higashi, 1999) | 2767 reflections with I > 2σ(I) |
Tmin = 0.161, Tmax = 0.533 | Rint = 0.044 |
29541 measured reflections |
R[F2 > 2σ(F2)] = 0.032 | 0 restraints |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.12 | Δρmax = 0.43 e Å−3 |
2934 reflections | Δρmin = −1.03 e Å−3 |
210 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 | ||
Br1 | 0.24719 (3) | 0.056869 (10) | 0.494126 (19) | 0.03961 (11) | |
O1 | −0.46425 (17) | 0.28009 (7) | −0.69867 (14) | 0.0406 (3) | |
O2 | 0.20106 (17) | 0.19970 (6) | −0.05734 (13) | 0.0342 (3) | |
O3 | 0.24997 (19) | 0.03129 (7) | −0.18371 (14) | 0.0405 (3) | |
C1 | −0.3611 (2) | 0.24042 (10) | −0.6033 (2) | 0.0324 (4) | |
C2 | −0.3738 (3) | 0.17558 (10) | −0.6441 (2) | 0.0384 (4) | |
H2 | −0.4485 | 0.1636 | −0.7292 | 0.046* | |
C3 | −0.2762 (3) | 0.13090 (10) | −0.5582 (2) | 0.0375 (4) | |
H3 | −0.2853 | 0.0885 | −0.5854 | 0.045* | |
C4 | −0.1608 (2) | 0.14784 (9) | −0.4282 (2) | 0.0302 (4) | |
C5 | −0.0537 (2) | 0.10319 (9) | −0.33881 (19) | 0.0303 (4) | |
H5 | −0.0616 | 0.0605 | −0.3643 | 0.036* | |
C6 | 0.0620 (2) | 0.12056 (9) | −0.21526 (18) | 0.0284 (4) | |
C7 | 0.0759 (2) | 0.18618 (9) | −0.17702 (18) | 0.0279 (4) | |
C8 | −0.0283 (2) | 0.23056 (9) | −0.26096 (19) | 0.0284 (4) | |
H8 | −0.0198 | 0.2730 | −0.2340 | 0.034* | |
C9 | −0.1488 (2) | 0.21296 (9) | −0.38808 (19) | 0.0278 (4) | |
C10 | −0.2524 (2) | 0.25890 (10) | −0.47798 (19) | 0.0303 (4) | |
H10 | −0.2466 | 0.3015 | −0.4520 | 0.036* | |
C11 | 0.1740 (2) | 0.06982 (9) | −0.1299 (2) | 0.0308 (4) | |
C12 | 0.1884 (2) | 0.06594 (8) | 0.02077 (19) | 0.0291 (4) | |
C13 | 0.0583 (2) | 0.09052 (9) | 0.0753 (2) | 0.0349 (4) | |
H13 | −0.0401 | 0.1100 | 0.0169 | 0.042* | |
C14 | 0.0731 (3) | 0.08652 (9) | 0.2154 (2) | 0.0363 (4) | |
H14 | −0.0155 | 0.1024 | 0.2509 | 0.044* | |
C15 | 0.2217 (3) | 0.05857 (8) | 0.3014 (2) | 0.0312 (4) | |
C16 | 0.3515 (3) | 0.03239 (10) | 0.2499 (2) | 0.0370 (4) | |
H16 | 0.4493 | 0.0127 | 0.3087 | 0.044* | |
C17 | 0.3339 (3) | 0.03590 (10) | 0.1099 (2) | 0.0358 (4) | |
H17 | 0.4200 | 0.0180 | 0.0743 | 0.043* | |
C18 | −0.4465 (3) | 0.34656 (10) | −0.6723 (2) | 0.0454 (5) | |
H18A | −0.5287 | 0.3692 | −0.7451 | 0.055* | |
H18B | −0.3286 | 0.3596 | −0.6683 | 0.055* | |
H18C | −0.4704 | 0.3558 | −0.5857 | 0.055* | |
C19 | 0.2347 (2) | 0.26549 (10) | −0.0224 (2) | 0.0348 (4) | |
H19A | 0.3294 | 0.2689 | 0.0609 | 0.042* | |
H19B | 0.1305 | 0.2847 | −0.0086 | 0.042* | |
H19C | 0.2667 | 0.2869 | −0.0962 | 0.042* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.05907 (18) | 0.03269 (17) | 0.02418 (16) | 0.00179 (8) | 0.00659 (11) | −0.00036 (7) |
O1 | 0.0367 (7) | 0.0454 (8) | 0.0321 (7) | 0.0022 (6) | −0.0032 (6) | 0.0083 (6) |
O2 | 0.0389 (7) | 0.0309 (7) | 0.0260 (7) | 0.0006 (5) | −0.0024 (5) | −0.0014 (5) |
O3 | 0.0488 (8) | 0.0407 (8) | 0.0321 (7) | 0.0134 (6) | 0.0113 (6) | −0.0007 (6) |
C1 | 0.0269 (8) | 0.0411 (11) | 0.0274 (9) | 0.0000 (7) | 0.0044 (7) | 0.0071 (8) |
C2 | 0.0370 (9) | 0.0451 (12) | 0.0269 (10) | −0.0061 (8) | −0.0017 (8) | 0.0000 (8) |
C3 | 0.0399 (10) | 0.0365 (11) | 0.0309 (11) | −0.0069 (8) | 0.0011 (8) | −0.0009 (9) |
C4 | 0.0301 (8) | 0.0321 (10) | 0.0278 (9) | −0.0050 (7) | 0.0071 (7) | 0.0003 (7) |
C5 | 0.0353 (9) | 0.0280 (9) | 0.0272 (9) | −0.0032 (7) | 0.0077 (7) | −0.0001 (7) |
C6 | 0.0310 (8) | 0.0298 (9) | 0.0248 (9) | 0.0001 (7) | 0.0083 (7) | 0.0030 (7) |
C7 | 0.0287 (8) | 0.0325 (9) | 0.0216 (8) | −0.0019 (7) | 0.0055 (6) | −0.0005 (7) |
C8 | 0.0308 (8) | 0.0271 (9) | 0.0263 (9) | −0.0003 (7) | 0.0066 (7) | −0.0001 (7) |
C9 | 0.0261 (8) | 0.0320 (10) | 0.0260 (9) | −0.0010 (7) | 0.0083 (7) | 0.0028 (7) |
C10 | 0.0298 (9) | 0.0326 (10) | 0.0282 (9) | −0.0004 (7) | 0.0074 (7) | 0.0036 (7) |
C11 | 0.0324 (9) | 0.0292 (9) | 0.0292 (10) | 0.0004 (7) | 0.0060 (7) | 0.0010 (8) |
C12 | 0.0331 (9) | 0.0248 (9) | 0.0282 (10) | 0.0013 (7) | 0.0063 (7) | 0.0023 (7) |
C13 | 0.0339 (9) | 0.0383 (10) | 0.0311 (10) | 0.0102 (8) | 0.0067 (8) | 0.0084 (8) |
C14 | 0.0404 (10) | 0.0361 (10) | 0.0337 (10) | 0.0087 (8) | 0.0123 (8) | 0.0054 (8) |
C15 | 0.0427 (10) | 0.0243 (9) | 0.0246 (9) | −0.0018 (7) | 0.0059 (8) | 0.0015 (7) |
C16 | 0.0371 (9) | 0.0375 (11) | 0.0313 (10) | 0.0092 (8) | 0.0006 (8) | 0.0032 (8) |
C17 | 0.0358 (9) | 0.0372 (11) | 0.0335 (10) | 0.0107 (8) | 0.0081 (8) | 0.0030 (9) |
C18 | 0.0429 (11) | 0.0452 (12) | 0.0415 (12) | 0.0071 (9) | 0.0004 (9) | 0.0127 (10) |
C19 | 0.0362 (9) | 0.0335 (11) | 0.0304 (9) | −0.0010 (7) | 0.0019 (8) | −0.0052 (8) |
Br1—C15 | 1.8942 (19) | C8—H8 | 0.9300 |
O1—C1 | 1.359 (2) | C9—C10 | 1.418 (3) |
O1—C18 | 1.422 (3) | C10—H10 | 0.9300 |
O2—C7 | 1.361 (2) | C11—C12 | 1.491 (3) |
O2—C19 | 1.433 (2) | C12—C13 | 1.390 (3) |
O3—C11 | 1.219 (2) | C12—C17 | 1.398 (3) |
C1—C10 | 1.372 (3) | C13—C14 | 1.384 (3) |
C1—C2 | 1.419 (3) | C13—H13 | 0.9300 |
C2—C3 | 1.362 (3) | C14—C15 | 1.383 (3) |
C2—H2 | 0.9300 | C14—H14 | 0.9300 |
C3—C4 | 1.419 (3) | C15—C16 | 1.383 (3) |
C3—H3 | 0.9300 | C16—C17 | 1.379 (3) |
C4—C5 | 1.409 (3) | C16—H16 | 0.9300 |
C4—C9 | 1.423 (3) | C17—H17 | 0.9300 |
C5—C6 | 1.374 (3) | C18—H18A | 0.9600 |
C5—H5 | 0.9300 | C18—H18B | 0.9600 |
C6—C7 | 1.428 (3) | C18—H18C | 0.9600 |
C6—C11 | 1.496 (3) | C19—H19A | 0.9600 |
C7—C8 | 1.370 (3) | C19—H19B | 0.9600 |
C8—C9 | 1.417 (2) | C19—H19C | 0.9600 |
C1—O1—C18 | 117.51 (15) | O3—C11—C6 | 120.23 (18) |
C7—O2—C19 | 117.30 (14) | C12—C11—C6 | 119.37 (16) |
O1—C1—C10 | 125.22 (19) | C13—C12—C17 | 118.65 (18) |
O1—C1—C2 | 113.82 (17) | C13—C12—C11 | 121.55 (16) |
C10—C1—C2 | 120.96 (17) | C17—C12—C11 | 119.78 (17) |
C3—C2—C1 | 119.73 (18) | C14—C13—C12 | 121.02 (17) |
C3—C2—H2 | 120.1 | C14—C13—H13 | 119.5 |
C1—C2—H2 | 120.1 | C12—C13—H13 | 119.5 |
C2—C3—C4 | 121.30 (19) | C15—C14—C13 | 118.84 (18) |
C2—C3—H3 | 119.4 | C15—C14—H14 | 120.6 |
C4—C3—H3 | 119.4 | C13—C14—H14 | 120.6 |
C5—C4—C3 | 122.78 (18) | C14—C15—C16 | 121.49 (18) |
C5—C4—C9 | 118.58 (16) | C14—C15—Br1 | 118.80 (15) |
C3—C4—C9 | 118.61 (17) | C16—C15—Br1 | 119.71 (14) |
C6—C5—C4 | 122.20 (17) | C17—C16—C15 | 119.00 (17) |
C6—C5—H5 | 118.9 | C17—C16—H16 | 120.5 |
C4—C5—H5 | 118.9 | C15—C16—H16 | 120.5 |
C5—C6—C7 | 118.89 (16) | C16—C17—C12 | 120.94 (18) |
C5—C6—C11 | 118.06 (17) | C16—C17—H17 | 119.5 |
C7—C6—C11 | 122.98 (16) | C12—C17—H17 | 119.5 |
O2—C7—C8 | 124.72 (16) | O1—C18—H18A | 109.5 |
O2—C7—C6 | 115.05 (15) | O1—C18—H18B | 109.5 |
C8—C7—C6 | 120.19 (16) | H18A—C18—H18B | 109.5 |
C7—C8—C9 | 121.22 (17) | O1—C18—H18C | 109.5 |
C7—C8—H8 | 119.4 | H18A—C18—H18C | 109.5 |
C9—C8—H8 | 119.4 | H18B—C18—H18C | 109.5 |
C8—C9—C10 | 121.58 (18) | O2—C19—H19A | 109.5 |
C8—C9—C4 | 118.88 (16) | O2—C19—H19B | 109.5 |
C10—C9—C4 | 119.50 (17) | H19A—C19—H19B | 109.5 |
C1—C10—C9 | 119.90 (19) | O2—C19—H19C | 109.5 |
C1—C10—H10 | 120.1 | H19A—C19—H19C | 109.5 |
C9—C10—H10 | 120.1 | H19B—C19—H19C | 109.5 |
O3—C11—C12 | 120.38 (17) | ||
C18—O1—C1—C10 | 6.0 (3) | C3—C4—C9—C10 | 0.4 (3) |
C18—O1—C1—C2 | −173.88 (17) | O1—C1—C10—C9 | −178.98 (17) |
O1—C1—C2—C3 | 179.56 (18) | C2—C1—C10—C9 | 0.9 (3) |
C10—C1—C2—C3 | −0.3 (3) | C8—C9—C10—C1 | 176.76 (17) |
C1—C2—C3—C4 | −0.2 (3) | C4—C9—C10—C1 | −0.9 (2) |
C2—C3—C4—C5 | −177.87 (19) | C5—C6—C11—O3 | 46.0 (3) |
C2—C3—C4—C9 | 0.2 (3) | C7—C6—C11—O3 | −131.1 (2) |
C3—C4—C5—C6 | 177.68 (18) | C5—C6—C11—C12 | −132.63 (18) |
C9—C4—C5—C6 | −0.3 (3) | C7—C6—C11—C12 | 50.3 (2) |
C4—C5—C6—C7 | −0.9 (3) | O3—C11—C12—C13 | −154.64 (19) |
C4—C5—C6—C11 | −178.08 (17) | C6—C11—C12—C13 | 24.0 (3) |
C19—O2—C7—C8 | −4.8 (2) | O3—C11—C12—C17 | 24.1 (3) |
C19—O2—C7—C6 | 172.93 (15) | C6—C11—C12—C17 | −157.30 (19) |
C5—C6—C7—O2 | −176.14 (16) | C17—C12—C13—C14 | 1.1 (3) |
C11—C6—C7—O2 | 0.9 (2) | C11—C12—C13—C14 | 179.87 (18) |
C5—C6—C7—C8 | 1.7 (3) | C12—C13—C14—C15 | 1.2 (3) |
C11—C6—C7—C8 | 178.79 (16) | C13—C14—C15—C16 | −2.7 (3) |
O2—C7—C8—C9 | 176.31 (16) | C13—C14—C15—Br1 | 176.93 (15) |
C6—C7—C8—C9 | −1.4 (3) | C14—C15—C16—C17 | 1.8 (3) |
C7—C8—C9—C10 | −177.62 (16) | Br1—C15—C16—C17 | −177.86 (15) |
C7—C8—C9—C4 | 0.1 (3) | C15—C16—C17—C12 | 0.7 (3) |
C5—C4—C9—C8 | 0.8 (3) | C13—C12—C17—C16 | −2.1 (3) |
C3—C4—C9—C8 | −177.36 (17) | C11—C12—C17—C16 | 179.15 (19) |
C5—C4—C9—C10 | 178.52 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
C19—H19A···O1i | 0.96 | 2.53 | 3.477 (2) | 170 |
C5—H5···Brii | 0.93 | 2.98 | 3.8441 (18) | 155 |
Symmetry codes: (i) x+1, y, z+1; (ii) −x, −y, −z. |
Experimental details
Crystal data | |
Chemical formula | C19H15BrO3 |
Mr | 371.22 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 193 |
a, b, c (Å) | 7.88917 (14), 21.0182 (4), 10.06272 (18) |
β (°) | 105.971 (1) |
V (Å3) | 1604.16 (5) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 3.60 |
Crystal size (mm) | 0.60 × 0.40 × 0.20 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Numerical (NUMABS; Higashi, 1999) |
Tmin, Tmax | 0.161, 0.533 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 29541, 2934, 2767 |
Rint | 0.044 |
(sin θ/λ)max (Å−1) | 0.602 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.032, 0.086, 1.12 |
No. of reflections | 2934 |
No. of parameters | 210 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.43, −1.03 |
Computer programs: PROCESS-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2004), SIR2004 (Burla et al., 2005), SHELXL97 (Sheldrick, 2008), ORTEPIII (Burnett & Johnson, 1996).
D—H···A | D—H | H···A | D···A | D—H···A |
C19—H19A···O1i | 0.96 | 2.53 | 3.477 (2) | 170 |
C5—H5···Brii | 0.93 | 2.98 | 3.8441 (18) | 155 |
Symmetry codes: (i) x+1, y, z+1; (ii) −x, −y, −z. |
Acknowledgements
The authors would express their gratitude to Professor Keiichi Noguchi, Instrumentation Analysis Center, Tokyo University of Agriculture & Technology, for technical advice. This work was partially supported by the Sasagawa Scientific Research Grant from the Japan Science Society.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
In the course of our study on selective electrophilic aromatic aroylation of 2,7-dimethoxynaphthalene, peri-aroylnaphthalene compounds have proved to be formed regioselectively with the aid of suitable acidic mediator (Okamoto & Yonezawa, 2009). Recently, we reported the structures of 1,8-diaroyl-2,7-dimethoxynaphthalenes, i. e., 1,8-bis(4-methylbenzoyl)-2,7-dimethoxynaphthalene (Muto et al., 2010), bis(4-bromophenyl)(2,7-dimethoxynaphthalene-1,8-diyl)dimethanone (Watanabe et al., 2010a), and 1-aroyl-2,7-dimethoxynaphthalene, i. e., 1-benzoyl-2,7-dimethoxynaphthalene (Kato et al., 2010). The aroyl groups at the 1,8-positions of the naphthalene rings in these compounds are twistedly bonded in a perpendicular manner but the benzene ring moieties of the aroyl groups tilt slightly toward the exo sides of the naphthalene rings. 1-Aroyl homologues also revealed essentially the same non-coplanar structure as observed for 1,8-diaroylated naphthalenes.
Furthermore, we also reported the crystal structure analysis of the corresponding β-isomers of 3-aroyl-2,7-dimethoxynaphthalenes such as 2-(4-chlorobenzoyl)-3,6-dimethoxynaphthalene (Nakaema et al., 2008) and (3,6-dimethoxy-2-naphthyl)(4-fluorophenyl)methanone (Watanabe et al., 2010b). In these 3-aroylated naphthalenes, which are generally regarded to be thermodynamically more stable than the corresponding 1-positioned isomeric molecules, the aroyl groups are shown connected to the naphthalene rings in a moderately twisted fashion. As part of our ongoing study on these homologous molecules, the synthesis and crystal structure of the title compound, a 3-monoaroylnaphthalene bearing a bromo group, is discussed in this article. The title compound was prepared by a direct condensation reaction of 2,7-dimethoxynaphthalene with 4-bromobenzoic acid.
The molecular structure of the title molecule is displayed in Fig. 1. The 4-bromophenyl group is bonded twistedly away from the attached naphthalene ring. The dihedral angle between the best planes of the bromophenyl ring (C12—C17) and the naphthalene ring (C1—C10) is 62.51 (8)°. The bridging carbonyl plane (O3—C6—C11—C12) makes a relatively large dihedral angle of 47.07 (9)° with the naphthalene ring (C1—C10) [C5—C6—C11—O3 torsion angle = 46.0 (2)°], whereas it makes a rather small angle of 24.20 (10)° with 4-bromophenyl ring (C12—C17) [O3—C11—C12—C17 torsion angle = 24.1 (3)°].
In the crystal structure, the molecular packing of the title compound is stabilized mainly by van der Waals interactions. Moreover, there is a C—H···O hydrogen bond between a hydrogen of the 2-methoxy group, which is situated adjacent to the bromophenyl group, and the ethereal oxygen atom of the 7-methoxy group in the neighboring molecule (Table 1, Fig. 2).
The crystal packing is additionally stabilized by two types of weak intermolecular interactions with the bromine atom: Br1···O3i = 3.2802 (14) Å, and Br1···H5ii = 2.98 Å [symmetry operations: (i) x, y, z + 1, (ii) -x, -y, -z] (Fig. 3) .