organic compounds
3-(4-Chlorophenylsulfinyl)-2,4,6-trimethyl-1-benzofuran
aDepartment of Chemistry, Dongeui University, San 24 Kaya-dong Busanjin-gu, Busan 614-714, Republic of Korea, and bDepartment of Chemistry, Pukyong National University, 599-1 Daeyeon 3-dong, Nam-gu, Busan 608-737, Republic of Korea
*Correspondence e-mail: uklee@pknu.ac.kr
In the title molecule, C17H15ClO2S, the 4-chlorophenyl ring is oriented approximately perpendicular to the mean plane of the benzofuran ring [dihedral angle = 88.98 (4)°]. In the crystal, molecules are linked through weak intermolecular C—H⋯O and C—H⋯π interactions, forming right-hand pseudo-helices along the a axis.
Related literature
For the structures of related benzofuran derivatives, see: Choi et al. (2010a,b). For the biological activity of benzofuran compounds, see: Aslam et al. (2006); Galal et al. (2009); Khan et al. (2005). For natural products containing benzofuran rings, see: Akgul & Anil (2003); Soekamto et al. (2003).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810038419/pv2330sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810038419/pv2330Isup2.hkl
3-Chloroperoxybenzoic acid (77%, 291 mg, 1.3 mmol) was added in small portions to a stirred solution of 3-(4-chlorophenylsulfanyl)-2,4,6-trimethyl-1-benzofuran (363 mg, 1.2 mmol) in dichloromethane (30 mL) at 273 K. After being stirred at room temperature for 3h, the mixture was washed with saturated sodium bicarbonate solution and the organic layer was separated, dried over magnesium sulfate, filtered and concentrated at reduced pressure. The residue was purified by
(silica gel, hexane–ethyl acetate, 2:1 v/v) to afford the title compound as a colorless solid [yield 83%, m.p. 452–453 K; Rf = 0.62 (hexane–ethyl acetate, 2:1 v/v)]. Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a solution of the title compound in ethyl acetate at room temperature.All H atoms were positioned geometrically and refined using a riding model, with C–H = 0.93 Å for aryl and 0.96 Å for methyl H atoms. Uiso(H) = 1.2Ueq(C) for aryl and 1.5Ueq(C) for methyl H atoms.
Many compounds involving a benzofuran ring system exhibit important pharmacological properties such as antifungal, antimicrobial, antitumor and antiviral activities (Aslam et al., 2006; Galal et al., 2009; Khan et al., 2005). These compounds widely occur in nature (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our study of the substituent effect on the solid state structures of 3-(4-chlorophenylsulfinyl)-2-methyl-1-benzofuran analogues (Choi et al., 2010a,b), we report herein the
of the title compound.In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.009 (2) Å from the least-squares plane defined by the nine constituent atoms. The 4-chlorophenyl ring makes a dihedral angle of 88.98 (4)° with the mean plane of the benzofuran fragment. The crystal packing (Fig. 2) is stabilized by a weak intermolecular C–H···O hydrogen bond between the 4-chlorophenyl H atom and the oxygen of the S═O unit (C13–H13···O2i; Table 1), and by an intermolecular C–H···π interaction between a methyl H atom and the 4-chlorophenyl ring (C11-H11C···Cgii; Table 1, Cg is the centroid of the C12–C17 4-chlorophenyl ring).
The title compound is crystallized in the non-centrosymmetric
Pna21 in spite of having no asymmetric C atoms. The is caused by a right hand pseudo-helix along the a axis (Fig. 2).For the structures of related benzofuran derivatives, see: Choi et al. (2010a,b). For the biological activity of benzofuran compounds, see: Aslam et al. (2006); Galal et al. (2009); Khan et al. (2005). For natural products containing benzofuran rings, see: Akgul & Anil (2003); Soekamto et al. (2003).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C17H15ClO2S | F(000) = 664 |
Mr = 318.80 | Dx = 1.391 Mg m−3 |
Orthorhombic, Pna21 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2c -2n | Cell parameters from 5206 reflections |
a = 12.1259 (10) Å | θ = 2.7–26.9° |
b = 19.3925 (16) Å | µ = 0.39 mm−1 |
c = 6.4744 (5) Å | T = 296 K |
V = 1522.5 (2) Å3 | Block, colourless |
Z = 4 | 0.44 × 0.28 × 0.17 mm |
Bruker SMART APEXII CCD diffractometer | 3468 independent reflections |
Radiation source: rotating anode | 3134 reflections with I > 2σ(I) |
Graphite multilayer monochromator | Rint = 0.028 |
Detector resolution: 10.0 pixels mm-1 | θmax = 27.5°, θmin = 2.0° |
φ and ω scans | h = −14→15 |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | k = −25→25 |
Tmin = 0.848, Tmax = 0.937 | l = −8→8 |
14409 measured reflections |
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) = 0.089 | w = 1/[σ2(Fo2) + (0.0507P)2 + 0.1747P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
3468 reflections | Δρmax = 0.16 e Å−3 |
194 parameters | Δρmin = −0.24 e Å−3 |
1 restraint | Absolute structure: Flack (1983), 1561 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.03 (6) |
C17H15ClO2S | V = 1522.5 (2) Å3 |
Mr = 318.80 | Z = 4 |
Orthorhombic, Pna21 | Mo Kα radiation |
a = 12.1259 (10) Å | µ = 0.39 mm−1 |
b = 19.3925 (16) Å | T = 296 K |
c = 6.4744 (5) Å | 0.44 × 0.28 × 0.17 mm |
Bruker SMART APEXII CCD diffractometer | 3468 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 3134 reflections with I > 2σ(I) |
Tmin = 0.848, Tmax = 0.937 | Rint = 0.028 |
14409 measured reflections |
R[F2 > 2σ(F2)] = 0.033 | H-atom parameters constrained |
wR(F2) = 0.089 | Δρmax = 0.16 e Å−3 |
S = 1.03 | Δρmin = −0.24 e Å−3 |
3468 reflections | Absolute structure: Flack (1983), 1561 Friedel pairs |
194 parameters | Absolute structure parameter: −0.03 (6) |
1 restraint |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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 | ||
S | 0.58821 (4) | 0.24616 (2) | 0.00652 (10) | 0.04345 (12) | |
Cl | 0.49572 (6) | 0.44910 (4) | 0.73907 (14) | 0.0840 (2) | |
O1 | 0.32383 (10) | 0.13450 (6) | −0.0716 (2) | 0.0445 (3) | |
O2 | 0.69629 (11) | 0.21294 (7) | 0.0504 (3) | 0.0574 (4) | |
C1 | 0.48058 (14) | 0.18533 (8) | 0.0312 (3) | 0.0377 (4) | |
C2 | 0.45571 (14) | 0.13178 (8) | 0.1815 (3) | 0.0373 (4) | |
C3 | 0.50175 (15) | 0.10563 (9) | 0.3645 (3) | 0.0418 (4) | |
C4 | 0.44487 (17) | 0.05245 (10) | 0.4608 (3) | 0.0483 (5) | |
H4 | 0.4739 | 0.0343 | 0.5821 | 0.058* | |
C5 | 0.34541 (15) | 0.02446 (10) | 0.3847 (4) | 0.0503 (5) | |
C6 | 0.30164 (16) | 0.04966 (9) | 0.2031 (4) | 0.0478 (5) | |
H6 | 0.2369 | 0.0319 | 0.1473 | 0.057* | |
C7 | 0.35838 (16) | 0.10246 (9) | 0.1083 (3) | 0.0400 (4) | |
C8 | 0.40014 (15) | 0.18465 (9) | −0.1136 (3) | 0.0405 (4) | |
C9 | 0.60623 (18) | 0.13287 (11) | 0.4595 (3) | 0.0535 (5) | |
H9A | 0.5897 | 0.1728 | 0.5416 | 0.080* | |
H9B | 0.6571 | 0.1453 | 0.3521 | 0.080* | |
H9C | 0.6386 | 0.0979 | 0.5452 | 0.080* | |
C10 | 0.2873 (2) | −0.03139 (12) | 0.5061 (6) | 0.0758 (7) | |
H10A | 0.2113 | −0.0334 | 0.4652 | 0.114* | |
H10B | 0.2919 | −0.0212 | 0.6509 | 0.114* | |
H10C | 0.3219 | −0.0750 | 0.4792 | 0.114* | |
C11 | 0.37730 (19) | 0.22734 (11) | −0.2970 (4) | 0.0509 (5) | |
H11A | 0.3126 | 0.2547 | −0.2729 | 0.076* | |
H11B | 0.3654 | 0.1980 | −0.4144 | 0.076* | |
H11C | 0.4390 | 0.2571 | −0.3232 | 0.076* | |
C12 | 0.55633 (14) | 0.30025 (8) | 0.2240 (3) | 0.0390 (4) | |
C13 | 0.45411 (16) | 0.33225 (10) | 0.2400 (4) | 0.0485 (5) | |
H13 | 0.3986 | 0.3226 | 0.1453 | 0.058* | |
C14 | 0.43614 (17) | 0.37853 (10) | 0.3984 (4) | 0.0522 (5) | |
H14 | 0.3684 | 0.4006 | 0.4111 | 0.063* | |
C15 | 0.51924 (18) | 0.39180 (9) | 0.5371 (4) | 0.0491 (5) | |
C16 | 0.62023 (17) | 0.36065 (9) | 0.5241 (4) | 0.0497 (4) | |
H16 | 0.6748 | 0.3699 | 0.6211 | 0.060* | |
C17 | 0.63960 (16) | 0.31487 (10) | 0.3627 (4) | 0.0464 (5) | |
H17 | 0.7084 | 0.2942 | 0.3483 | 0.056* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S | 0.0401 (2) | 0.0491 (2) | 0.0411 (2) | −0.00916 (18) | 0.0045 (2) | 0.0011 (2) |
Cl | 0.0895 (5) | 0.0805 (4) | 0.0819 (5) | 0.0023 (4) | 0.0111 (4) | −0.0341 (4) |
O1 | 0.0401 (7) | 0.0475 (7) | 0.0461 (8) | −0.0058 (5) | −0.0063 (6) | 0.0037 (6) |
O2 | 0.0389 (7) | 0.0638 (8) | 0.0695 (11) | −0.0017 (6) | 0.0088 (7) | −0.0075 (8) |
C1 | 0.0372 (8) | 0.0412 (8) | 0.0347 (9) | −0.0036 (6) | 0.0007 (8) | −0.0015 (7) |
C2 | 0.0358 (9) | 0.0383 (8) | 0.0377 (9) | 0.0011 (7) | 0.0055 (8) | −0.0016 (7) |
C3 | 0.0408 (9) | 0.0443 (9) | 0.0403 (10) | 0.0061 (7) | 0.0006 (8) | −0.0016 (8) |
C4 | 0.0461 (10) | 0.0503 (10) | 0.0485 (12) | 0.0094 (8) | 0.0031 (9) | 0.0120 (8) |
C5 | 0.0449 (11) | 0.0427 (9) | 0.0632 (14) | 0.0044 (7) | 0.0116 (10) | 0.0114 (9) |
C6 | 0.0366 (9) | 0.0418 (8) | 0.0649 (14) | −0.0034 (7) | 0.0024 (9) | 0.0049 (9) |
C7 | 0.0381 (9) | 0.0405 (8) | 0.0416 (10) | 0.0022 (7) | 0.0013 (8) | 0.0001 (8) |
C8 | 0.0407 (9) | 0.0428 (9) | 0.0380 (10) | −0.0026 (7) | 0.0010 (8) | −0.0006 (7) |
C9 | 0.0506 (12) | 0.0615 (12) | 0.0485 (14) | 0.0018 (9) | −0.0076 (10) | 0.0025 (9) |
C10 | 0.0633 (14) | 0.0679 (13) | 0.096 (2) | −0.0044 (11) | 0.0056 (16) | 0.0395 (15) |
C11 | 0.0522 (11) | 0.0588 (11) | 0.0416 (11) | −0.0017 (10) | −0.0031 (9) | 0.0068 (9) |
C12 | 0.0379 (9) | 0.0373 (8) | 0.0417 (10) | −0.0054 (7) | −0.0014 (8) | 0.0037 (8) |
C13 | 0.0431 (10) | 0.0481 (10) | 0.0542 (12) | −0.0012 (8) | −0.0102 (10) | 0.0042 (9) |
C14 | 0.0441 (10) | 0.0460 (10) | 0.0666 (14) | 0.0061 (8) | −0.0001 (10) | 0.0011 (10) |
C15 | 0.0583 (12) | 0.0382 (9) | 0.0508 (12) | −0.0032 (8) | 0.0049 (10) | −0.0034 (9) |
C16 | 0.0481 (10) | 0.0501 (10) | 0.0509 (12) | −0.0060 (8) | −0.0088 (11) | −0.0027 (10) |
C17 | 0.0358 (9) | 0.0481 (9) | 0.0553 (13) | −0.0030 (8) | −0.0046 (9) | −0.0018 (9) |
S—O2 | 1.4878 (15) | C9—H9A | 0.9600 |
S—C1 | 1.7665 (17) | C9—H9B | 0.9600 |
S—C12 | 1.798 (2) | C9—H9C | 0.9600 |
Cl—C15 | 1.740 (2) | C10—H10A | 0.9600 |
O1—C8 | 1.370 (2) | C10—H10B | 0.9600 |
O1—C7 | 1.385 (2) | C10—H10C | 0.9600 |
C1—C8 | 1.353 (3) | C11—H11A | 0.9600 |
C1—C2 | 1.455 (2) | C11—H11B | 0.9600 |
C2—C7 | 1.393 (3) | C11—H11C | 0.9600 |
C2—C3 | 1.405 (3) | C12—C17 | 1.381 (3) |
C3—C4 | 1.389 (3) | C12—C13 | 1.390 (3) |
C3—C9 | 1.504 (3) | C13—C14 | 1.380 (3) |
C4—C5 | 1.411 (3) | C13—H13 | 0.9300 |
C4—H4 | 0.9300 | C14—C15 | 1.374 (3) |
C5—C6 | 1.379 (3) | C14—H14 | 0.9300 |
C5—C10 | 1.512 (3) | C15—C16 | 1.368 (3) |
C6—C7 | 1.378 (3) | C16—C17 | 1.391 (3) |
C6—H6 | 0.9300 | C16—H16 | 0.9300 |
C8—C11 | 1.474 (3) | C17—H17 | 0.9300 |
O2—S—C1 | 110.14 (8) | H9A—C9—H9C | 109.5 |
O2—S—C12 | 107.01 (9) | H9B—C9—H9C | 109.5 |
C1—S—C12 | 99.20 (8) | C5—C10—H10A | 109.5 |
C8—O1—C7 | 106.32 (15) | C5—C10—H10B | 109.5 |
C8—C1—C2 | 107.89 (15) | H10A—C10—H10B | 109.5 |
C8—C1—S | 118.45 (14) | C5—C10—H10C | 109.5 |
C2—C1—S | 133.66 (14) | H10A—C10—H10C | 109.5 |
C7—C2—C3 | 118.46 (16) | H10B—C10—H10C | 109.5 |
C7—C2—C1 | 103.84 (16) | C8—C11—H11A | 109.5 |
C3—C2—C1 | 137.70 (17) | C8—C11—H11B | 109.5 |
C4—C3—C2 | 116.71 (17) | H11A—C11—H11B | 109.5 |
C4—C3—C9 | 119.73 (19) | C8—C11—H11C | 109.5 |
C2—C3—C9 | 123.55 (18) | H11A—C11—H11C | 109.5 |
C3—C4—C5 | 123.59 (19) | H11B—C11—H11C | 109.5 |
C3—C4—H4 | 118.2 | C17—C12—C13 | 120.78 (18) |
C5—C4—H4 | 118.2 | C17—C12—S | 118.16 (14) |
C6—C5—C4 | 119.37 (18) | C13—C12—S | 120.72 (15) |
C6—C5—C10 | 121.2 (2) | C14—C13—C12 | 119.13 (19) |
C4—C5—C10 | 119.5 (2) | C14—C13—H13 | 120.4 |
C7—C6—C5 | 116.80 (19) | C12—C13—H13 | 120.4 |
C7—C6—H6 | 121.6 | C15—C14—C13 | 119.45 (18) |
C5—C6—H6 | 121.6 | C15—C14—H14 | 120.3 |
C6—C7—O1 | 123.85 (18) | C13—C14—H14 | 120.3 |
C6—C7—C2 | 125.07 (18) | C16—C15—C14 | 122.23 (19) |
O1—C7—C2 | 111.06 (15) | C16—C15—Cl | 118.38 (18) |
C1—C8—O1 | 110.88 (17) | C14—C15—Cl | 119.39 (16) |
C1—C8—C11 | 133.50 (17) | C15—C16—C17 | 118.6 (2) |
O1—C8—C11 | 115.58 (16) | C15—C16—H16 | 120.7 |
C3—C9—H9A | 109.5 | C17—C16—H16 | 120.7 |
C3—C9—H9B | 109.5 | C12—C17—C16 | 119.75 (18) |
H9A—C9—H9B | 109.5 | C12—C17—H17 | 120.1 |
C3—C9—H9C | 109.5 | C16—C17—H17 | 120.1 |
O2—S—C1—C8 | −136.54 (15) | C1—C2—C7—C6 | −178.86 (18) |
C12—S—C1—C8 | 111.43 (16) | C3—C2—C7—O1 | 179.46 (15) |
O2—S—C1—C2 | 43.6 (2) | C1—C2—C7—O1 | −0.29 (19) |
C12—S—C1—C2 | −68.45 (18) | C2—C1—C8—O1 | −0.3 (2) |
C8—C1—C2—C7 | 0.3 (2) | S—C1—C8—O1 | 179.82 (13) |
S—C1—C2—C7 | −179.78 (15) | C2—C1—C8—C11 | 177.3 (2) |
C8—C1—C2—C3 | −179.3 (2) | S—C1—C8—C11 | −2.6 (3) |
S—C1—C2—C3 | 0.6 (3) | C7—O1—C8—C1 | 0.1 (2) |
C7—C2—C3—C4 | −0.9 (3) | C7—O1—C8—C11 | −177.95 (16) |
C1—C2—C3—C4 | 178.8 (2) | O2—S—C12—C17 | 14.13 (17) |
C7—C2—C3—C9 | −179.91 (18) | C1—S—C12—C17 | 128.60 (15) |
C1—C2—C3—C9 | −0.3 (3) | O2—S—C12—C13 | −172.53 (15) |
C2—C3—C4—C5 | −0.1 (3) | C1—S—C12—C13 | −58.05 (16) |
C9—C3—C4—C5 | 178.97 (19) | C17—C12—C13—C14 | −0.7 (3) |
C3—C4—C5—C6 | 1.1 (3) | S—C12—C13—C14 | −173.88 (15) |
C3—C4—C5—C10 | −177.4 (2) | C12—C13—C14—C15 | −0.3 (3) |
C4—C5—C6—C7 | −1.1 (3) | C13—C14—C15—C16 | 0.1 (3) |
C10—C5—C6—C7 | 177.4 (2) | C13—C14—C15—Cl | −178.98 (17) |
C5—C6—C7—O1 | −178.26 (17) | C14—C15—C16—C17 | 1.0 (3) |
C5—C6—C7—C2 | 0.1 (3) | Cl—C15—C16—C17 | −179.89 (16) |
C8—O1—C7—C6 | 178.73 (19) | C13—C12—C17—C16 | 1.8 (3) |
C8—O1—C7—C2 | 0.14 (19) | S—C12—C17—C16 | 175.18 (16) |
C3—C2—C7—C6 | 0.9 (3) | C15—C16—C17—C12 | −2.0 (3) |
Cg is the centroid of the C12–C17 4-chlorophenyl ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C13—H13···O2i | 0.93 | 2.62 | 3.471 (2) | 152 |
C11—H11C···Cgii | 0.96 | 2.85 | 3.667 (2) | 144 |
Symmetry codes: (i) x−1/2, −y+1/2, z; (ii) x, y, z−1. |
Experimental details
Crystal data | |
Chemical formula | C17H15ClO2S |
Mr | 318.80 |
Crystal system, space group | Orthorhombic, Pna21 |
Temperature (K) | 296 |
a, b, c (Å) | 12.1259 (10), 19.3925 (16), 6.4744 (5) |
V (Å3) | 1522.5 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.39 |
Crystal size (mm) | 0.44 × 0.28 × 0.17 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.848, 0.937 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14409, 3468, 3134 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.089, 1.03 |
No. of reflections | 3468 |
No. of parameters | 194 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.16, −0.24 |
Absolute structure | Flack (1983), 1561 Friedel pairs |
Absolute structure parameter | −0.03 (6) |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998).
Cg is the centroid of the C12–C17 4-chlorophenyl ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C13—H13···O2i | 0.93 | 2.62 | 3.471 (2) | 152.3 |
C11—H11C···Cgii | 0.96 | 2.85 | 3.667 (2) | 144.1 |
Symmetry codes: (i) x−1/2, −y+1/2, z; (ii) x, y, z−1. |
References
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Many compounds involving a benzofuran ring system exhibit important pharmacological properties such as antifungal, antimicrobial, antitumor and antiviral activities (Aslam et al., 2006; Galal et al., 2009; Khan et al., 2005). These compounds widely occur in nature (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our study of the substituent effect on the solid state structures of 3-(4-chlorophenylsulfinyl)-2-methyl-1-benzofuran analogues (Choi et al., 2010a,b), we report herein the crystal structure of the title compound.
In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.009 (2) Å from the least-squares plane defined by the nine constituent atoms. The 4-chlorophenyl ring makes a dihedral angle of 88.98 (4)° with the mean plane of the benzofuran fragment. The crystal packing (Fig. 2) is stabilized by a weak intermolecular C–H···O hydrogen bond between the 4-chlorophenyl H atom and the oxygen of the S═O unit (C13–H13···O2i; Table 1), and by an intermolecular C–H···π interaction between a methyl H atom and the 4-chlorophenyl ring (C11-H11C···Cgii; Table 1, Cg is the centroid of the C12–C17 4-chlorophenyl ring).
The title compound is crystallized in the non-centrosymmetric space group Pna21 in spite of having no asymmetric C atoms. The space group is caused by a right hand pseudo-helix along the a axis (Fig. 2).