organic compounds
3-Ethylsulfinyl-2-(4-iodophenyl)-5-methyl-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 compound, C17H15IO2S, the 4-iodophenyl ring makes a dihedral angle of 35.39 (8)° with the plane of the benzofuran fragment. In the crystal, molecules are linked by intermolecular C—H⋯O and C—H⋯π interactions, and an I⋯O contact [3.378 (2) Å]. The also exhibits aromatic π–π interactions between the benzene rings of neighbouring molecules [centroid–centroid distance = 3.495 (3) Å].
Related literature
For the pharmacological activity of benzofuran compounds, see: Aslam et al. (2006); Galal et al. (2009); Khan et al. (2005). For natural products with benzofuran rings, see: Akgul & Anil (2003); Soekamto et al. (2003). For the structures of related 3-ethylsulfinyl-5-halo-2-(4-halophenyl)-1-benzofuran derivatives, see: Choi et al. (2010a,b,c). For a review of halogen bonding, see: Politzer et al. (2007).
Experimental
Crystal data
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Refinement
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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/S1600536810026620/bg2357sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810026620/bg2357Isup2.hkl
77% 3-chloroperoxybenzoic acid (202 mg, 0.9 mmol) was added in small portions to a stirred solution of 3-ethylsulfanyl-2-(4-iodophenyl)-5-methyl-1-benzofurans (315 mg, 0.8 mmol) in dichloromethane (40 mL) at 273 K. After being stirred at room temperature for 4h, 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
(hexane-ethyl acetate, 1:2 v/v) to afford the title compound as a colorless solid [yield 79%, m.p. 431–432 K; Rf = 0.63 (hexane–ethyl acetate, 1:2 v/v)]. Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a solution of the title compound in tetrahydrofuran at room temperature.All H atoms were positioned geometrically and refined using a riding model, with C—H = 0.93 Å for aryl, 0.96 Å for methylene and methyl H atoms. Uiso(H) = 1.2Ueq(C) for aryl and methylene H atoms, and 1.5Ueq(C) for methyl H atoms.
The benzofuran ring system show interesting pharmacological properties such as antifungal (Aslam et al., 2006), antitumor and antiviral (Galal et al., 2009), antimicrobial (Khan et al., 2005) activities. These compounds widely occur in nature (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our continuing studies of the substituent effect on the solid state structures of 3-ethylsulfinyl-5-halo-2-(4-halophenyl)-1-benzofuran analogues (Choi et al., 2010a,b,c), we report the
of the title compound (Fig. 1).The benzofuran unit is essentially planar, with a mean deviation of 0.021 (2) Å from the least-squares plane defined by the nine constituent atoms. The dihedral angle formed by the benzofuran plane and the 4-iodophenyl ring is 35.39 (8)°. The crystal packing (Fig. 2) is stabilized by a weak intermolecular C—H···O hydrogen bond between the methylene H atom of the ethyl group and the oxygen of the S═O unit, with a C16—16B···O2i (Table 1), and by an I···O halogen-bonding between the iodine and the oxygen of the S═O unit [I···O2iii = 3.378 (2) Å; C12—I···O2iii = 162.46 (7)°] (Politzer et al., 2007). The molecular packing (Fig. 3) is further stabilized by an intermolecular C—H···π interaction between the 4-iodophenyl H atom and the benzene ring of a neighbouring molecule, with a C11—H11···Cgii (Table 1), and by an aromatic π–π interaction between the benzene rings of neighbouring molecules, with a Cg···Cgv distance of 3.495 (3) Å (Cg is the centroid of the C2–C7 benzene ring).
For the pharmacological activity of benzofuran compounds, see: Aslam et al. (2006); Galal et al. (2009); Khan et al. (2005). For natural products with benzofuran rings, see: Akgul & Anil (2003); Soekamto et al. (2003). For the structures of related 3-ethylsulfinyl-5-halo-2-(4-halophenyl)-1-benzofuran derivatives, see: Choi et al. (2010a,b,c). For a review of halogen bonding, see: Politzer et al. (2007).
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).C17H15IO2S | F(000) = 808 |
Mr = 410.25 | Dx = 1.706 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 9921 reflections |
a = 10.1034 (3) Å | θ = 2.3–27.5° |
b = 13.1942 (4) Å | µ = 2.14 mm−1 |
c = 11.9933 (3) Å | T = 173 K |
β = 92.634 (1)° | Block, colourless |
V = 1597.09 (8) Å3 | 0.32 × 0.27 × 0.09 mm |
Z = 4 |
Bruker SMART APEXII CCD diffractometer | 3667 independent reflections |
Radiation source: rotating anode | 3366 reflections with I > 2σ(I) |
Graphite multilayer monochromator | Rint = 0.025 |
Detector resolution: 10.0 pixels mm-1 | θmax = 27.5°, θmin = 2.3° |
φ and ω scans | h = −8→13 |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | k = −17→10 |
Tmin = 0.551, Tmax = 0.834 | l = −15→15 |
15129 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)] = 0.026 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.069 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0328P)2 + 1.5593P] where P = (Fo2 + 2Fc2)/3 |
3667 reflections | (Δ/σ)max = 0.001 |
192 parameters | Δρmax = 0.96 e Å−3 |
0 restraints | Δρmin = −0.69 e Å−3 |
C17H15IO2S | V = 1597.09 (8) Å3 |
Mr = 410.25 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 10.1034 (3) Å | µ = 2.14 mm−1 |
b = 13.1942 (4) Å | T = 173 K |
c = 11.9933 (3) Å | 0.32 × 0.27 × 0.09 mm |
β = 92.634 (1)° |
Bruker SMART APEXII CCD diffractometer | 3667 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 3366 reflections with I > 2σ(I) |
Tmin = 0.551, Tmax = 0.834 | Rint = 0.025 |
15129 measured reflections |
R[F2 > 2σ(F2)] = 0.026 | 0 restraints |
wR(F2) = 0.069 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.96 e Å−3 |
3667 reflections | Δρmin = −0.69 e Å−3 |
192 parameters |
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 | ||
I | 0.491732 (16) | 0.129285 (13) | 1.209790 (12) | 0.03433 (7) | |
S | 0.44476 (6) | 0.12571 (4) | 0.57565 (5) | 0.02928 (13) | |
O2 | 0.5466 (2) | 0.12728 (14) | 0.48973 (19) | 0.0451 (5) | |
O1 | 0.36148 (16) | 0.39156 (12) | 0.71054 (13) | 0.0269 (3) | |
C1 | 0.4080 (2) | 0.25304 (17) | 0.60955 (18) | 0.0254 (4) | |
C2 | 0.3800 (2) | 0.33516 (18) | 0.53236 (19) | 0.0253 (4) | |
C3 | 0.3795 (2) | 0.34768 (18) | 0.41673 (19) | 0.0281 (5) | |
H3 | 0.3964 | 0.2931 | 0.3704 | 0.034* | |
C4 | 0.3531 (2) | 0.44313 (19) | 0.3722 (2) | 0.0292 (5) | |
C5 | 0.3273 (2) | 0.52457 (18) | 0.4432 (2) | 0.0300 (5) | |
H5 | 0.3108 | 0.5881 | 0.4120 | 0.036* | |
C6 | 0.3253 (2) | 0.51387 (18) | 0.5580 (2) | 0.0290 (5) | |
H6 | 0.3068 | 0.5680 | 0.6045 | 0.035* | |
C7 | 0.3525 (2) | 0.41812 (17) | 0.59933 (18) | 0.0253 (4) | |
C8 | 0.3968 (2) | 0.29066 (17) | 0.71460 (18) | 0.0255 (4) | |
C9 | 0.4144 (2) | 0.24931 (17) | 0.82760 (18) | 0.0261 (4) | |
C10 | 0.5115 (2) | 0.1770 (2) | 0.85308 (19) | 0.0309 (5) | |
H10 | 0.5633 | 0.1525 | 0.7969 | 0.037* | |
C11 | 0.5319 (3) | 0.14090 (19) | 0.9612 (2) | 0.0315 (5) | |
H11 | 0.5966 | 0.0923 | 0.9775 | 0.038* | |
C12 | 0.4547 (2) | 0.17826 (18) | 1.04487 (18) | 0.0276 (5) | |
C13 | 0.3559 (2) | 0.24893 (18) | 1.02076 (19) | 0.0288 (5) | |
H13 | 0.3034 | 0.2725 | 1.0769 | 0.035* | |
C14 | 0.3359 (2) | 0.28432 (18) | 0.91224 (19) | 0.0283 (5) | |
H14 | 0.2697 | 0.3317 | 0.8959 | 0.034* | |
C15 | 0.3528 (3) | 0.4598 (2) | 0.2475 (2) | 0.0384 (6) | |
H15A | 0.4124 | 0.4127 | 0.2151 | 0.058* | |
H15B | 0.3810 | 0.5278 | 0.2326 | 0.058* | |
H15C | 0.2649 | 0.4496 | 0.2156 | 0.058* | |
C16 | 0.2900 (3) | 0.0929 (2) | 0.5052 (2) | 0.0372 (6) | |
H16A | 0.2704 | 0.1419 | 0.4465 | 0.045* | |
H16B | 0.2984 | 0.0270 | 0.4705 | 0.045* | |
C17 | 0.1766 (3) | 0.0902 (2) | 0.5821 (3) | 0.0486 (7) | |
H17A | 0.1975 | 0.0446 | 0.6428 | 0.073* | |
H17B | 0.0981 | 0.0673 | 0.5417 | 0.073* | |
H17C | 0.1620 | 0.1569 | 0.6109 | 0.073* |
U11 | U22 | U33 | U12 | U13 | U23 | |
I | 0.03738 (11) | 0.04108 (12) | 0.02435 (9) | 0.00488 (7) | −0.00062 (7) | 0.00094 (6) |
S | 0.0299 (3) | 0.0259 (3) | 0.0322 (3) | 0.0037 (2) | 0.0021 (2) | −0.0051 (2) |
O2 | 0.0406 (11) | 0.0417 (11) | 0.0547 (13) | 0.0043 (8) | 0.0192 (10) | −0.0043 (9) |
O1 | 0.0306 (8) | 0.0241 (8) | 0.0258 (8) | 0.0025 (6) | −0.0021 (6) | −0.0040 (6) |
C1 | 0.0272 (11) | 0.0226 (11) | 0.0264 (10) | 0.0002 (8) | 0.0006 (8) | −0.0023 (8) |
C2 | 0.0228 (10) | 0.0249 (11) | 0.0283 (11) | −0.0021 (9) | 0.0007 (8) | −0.0019 (9) |
C3 | 0.0284 (11) | 0.0286 (11) | 0.0275 (11) | −0.0032 (9) | 0.0035 (9) | −0.0028 (9) |
C4 | 0.0242 (11) | 0.0340 (12) | 0.0294 (11) | −0.0053 (9) | 0.0023 (9) | 0.0032 (9) |
C5 | 0.0259 (11) | 0.0265 (11) | 0.0373 (12) | −0.0018 (9) | −0.0010 (9) | 0.0042 (9) |
C6 | 0.0267 (11) | 0.0257 (11) | 0.0344 (12) | 0.0002 (9) | −0.0014 (9) | −0.0040 (9) |
C7 | 0.0235 (10) | 0.0271 (11) | 0.0253 (10) | −0.0013 (9) | −0.0010 (8) | −0.0028 (8) |
C8 | 0.0243 (10) | 0.0242 (11) | 0.0278 (10) | 0.0020 (8) | −0.0005 (8) | −0.0027 (8) |
C9 | 0.0260 (11) | 0.0277 (11) | 0.0244 (10) | 0.0001 (9) | −0.0017 (8) | −0.0032 (8) |
C10 | 0.0283 (12) | 0.0400 (14) | 0.0244 (10) | 0.0086 (10) | 0.0020 (9) | −0.0033 (9) |
C11 | 0.0288 (12) | 0.0362 (13) | 0.0290 (11) | 0.0079 (10) | −0.0031 (9) | −0.0034 (9) |
C12 | 0.0293 (11) | 0.0298 (12) | 0.0234 (10) | −0.0015 (9) | −0.0014 (9) | −0.0037 (9) |
C13 | 0.0308 (12) | 0.0295 (12) | 0.0265 (11) | 0.0034 (9) | 0.0035 (9) | −0.0048 (9) |
C14 | 0.0280 (11) | 0.0258 (11) | 0.0310 (11) | 0.0049 (9) | −0.0002 (9) | −0.0032 (9) |
C15 | 0.0434 (15) | 0.0424 (15) | 0.0298 (12) | −0.0048 (12) | 0.0044 (10) | 0.0068 (11) |
C16 | 0.0397 (14) | 0.0326 (13) | 0.0392 (13) | −0.0019 (11) | −0.0007 (11) | −0.0048 (11) |
C17 | 0.0383 (15) | 0.0398 (15) | 0.068 (2) | −0.0042 (12) | 0.0118 (14) | −0.0039 (14) |
I—C12 | 2.098 (2) | C9—C10 | 1.392 (3) |
I—O2i | 3.378 (2) | C9—C14 | 1.395 (3) |
S—O2 | 1.490 (2) | C10—C11 | 1.388 (3) |
S—C1 | 1.772 (2) | C10—H10 | 0.9300 |
S—C16 | 1.796 (3) | C11—C12 | 1.390 (3) |
O1—C7 | 1.378 (3) | C11—H11 | 0.9300 |
O1—C8 | 1.379 (3) | C12—C13 | 1.386 (3) |
C1—C8 | 1.364 (3) | C13—C14 | 1.389 (3) |
C1—C2 | 1.445 (3) | C13—H13 | 0.9300 |
C2—C7 | 1.393 (3) | C14—H14 | 0.9300 |
C2—C3 | 1.396 (3) | C15—H15A | 0.9600 |
C3—C4 | 1.389 (3) | C15—H15B | 0.9600 |
C3—H3 | 0.9300 | C15—H15C | 0.9600 |
C4—C5 | 1.402 (3) | C16—C17 | 1.503 (4) |
C4—C15 | 1.513 (3) | C16—H16A | 0.9700 |
C5—C6 | 1.386 (3) | C16—H16B | 0.9700 |
C5—H5 | 0.9300 | C17—H17A | 0.9600 |
C6—C7 | 1.380 (3) | C17—H17B | 0.9600 |
C6—H6 | 0.9300 | C17—H17C | 0.9600 |
C8—C9 | 1.464 (3) | ||
C12—I—O2i | 162.46 (7) | C11—C10—H10 | 119.6 |
O2—S—C1 | 107.71 (11) | C9—C10—H10 | 119.6 |
O2—S—C16 | 107.00 (13) | C10—C11—C12 | 119.3 (2) |
C1—S—C16 | 98.58 (12) | C10—C11—H11 | 120.4 |
C7—O1—C8 | 106.57 (17) | C12—C11—H11 | 120.4 |
C8—C1—C2 | 107.27 (19) | C13—C12—C11 | 120.7 (2) |
C8—C1—S | 125.75 (18) | C13—C12—I | 119.95 (16) |
C2—C1—S | 126.94 (17) | C11—C12—I | 119.34 (18) |
C7—C2—C3 | 119.2 (2) | C12—C13—C14 | 119.6 (2) |
C7—C2—C1 | 104.97 (19) | C12—C13—H13 | 120.2 |
C3—C2—C1 | 135.8 (2) | C14—C13—H13 | 120.2 |
C4—C3—C2 | 118.7 (2) | C13—C14—C9 | 120.5 (2) |
C4—C3—H3 | 120.6 | C13—C14—H14 | 119.8 |
C2—C3—H3 | 120.6 | C9—C14—H14 | 119.8 |
C3—C4—C5 | 120.0 (2) | C4—C15—H15A | 109.5 |
C3—C4—C15 | 120.3 (2) | C4—C15—H15B | 109.5 |
C5—C4—C15 | 119.8 (2) | H15A—C15—H15B | 109.5 |
C6—C5—C4 | 122.4 (2) | C4—C15—H15C | 109.5 |
C6—C5—H5 | 118.8 | H15A—C15—H15C | 109.5 |
C4—C5—H5 | 118.8 | H15B—C15—H15C | 109.5 |
C7—C6—C5 | 116.0 (2) | C17—C16—S | 112.9 (2) |
C7—C6—H6 | 122.0 | C17—C16—H16A | 109.0 |
C5—C6—H6 | 122.0 | S—C16—H16A | 109.0 |
O1—C7—C6 | 125.7 (2) | C17—C16—H16B | 109.0 |
O1—C7—C2 | 110.6 (2) | S—C16—H16B | 109.0 |
C6—C7—C2 | 123.6 (2) | H16A—C16—H16B | 107.8 |
C1—C8—O1 | 110.56 (19) | C16—C17—H17A | 109.5 |
C1—C8—C9 | 135.1 (2) | C16—C17—H17B | 109.5 |
O1—C8—C9 | 114.37 (18) | H17A—C17—H17B | 109.5 |
C10—C9—C14 | 119.0 (2) | C16—C17—H17C | 109.5 |
C10—C9—C8 | 120.9 (2) | H17A—C17—H17C | 109.5 |
C14—C9—C8 | 120.1 (2) | H17B—C17—H17C | 109.5 |
C11—C10—C9 | 120.9 (2) | ||
O2—S—C1—C8 | −134.9 (2) | C2—C1—C8—O1 | 0.8 (3) |
C16—S—C1—C8 | 114.1 (2) | S—C1—C8—O1 | −177.22 (16) |
O2—S—C1—C2 | 47.4 (2) | C2—C1—C8—C9 | −178.6 (2) |
C16—S—C1—C2 | −63.6 (2) | S—C1—C8—C9 | 3.3 (4) |
C8—C1—C2—C7 | −0.4 (3) | C7—O1—C8—C1 | −1.0 (2) |
S—C1—C2—C7 | 177.68 (17) | C7—O1—C8—C9 | 178.56 (19) |
C8—C1—C2—C3 | 177.1 (3) | C1—C8—C9—C10 | 34.9 (4) |
S—C1—C2—C3 | −4.8 (4) | O1—C8—C9—C10 | −144.5 (2) |
C7—C2—C3—C4 | 0.8 (3) | C1—C8—C9—C14 | −146.9 (3) |
C1—C2—C3—C4 | −176.4 (2) | O1—C8—C9—C14 | 33.7 (3) |
C2—C3—C4—C5 | −0.2 (3) | C14—C9—C10—C11 | −1.0 (4) |
C2—C3—C4—C15 | 179.5 (2) | C8—C9—C10—C11 | 177.2 (2) |
C3—C4—C5—C6 | −0.7 (4) | C9—C10—C11—C12 | −0.4 (4) |
C15—C4—C5—C6 | 179.6 (2) | C10—C11—C12—C13 | 1.6 (4) |
C4—C5—C6—C7 | 1.0 (3) | C10—C11—C12—I | −176.97 (19) |
C8—O1—C7—C6 | −176.9 (2) | C11—C12—C13—C14 | −1.4 (4) |
C8—O1—C7—C2 | 0.8 (2) | I—C12—C13—C14 | 177.17 (18) |
C5—C6—C7—O1 | 177.0 (2) | C12—C13—C14—C9 | 0.0 (4) |
C5—C6—C7—C2 | −0.3 (3) | C10—C9—C14—C13 | 1.2 (4) |
C3—C2—C7—O1 | −178.3 (2) | C8—C9—C14—C13 | −177.1 (2) |
C1—C2—C7—O1 | −0.3 (2) | O2—S—C16—C17 | −179.0 (2) |
C3—C2—C7—C6 | −0.6 (4) | C1—S—C16—C17 | −67.5 (2) |
C1—C2—C7—C6 | 177.4 (2) |
Symmetry code: (i) x, y, z+1. |
Cg is the centroid of the C2–C7 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C16—H16B···O2ii | 0.97 | 2.60 | 3.341 (3) | 134 |
C11—H11···Cgiii | 0.93 | 2.61 | 3.378 (3) | 141 |
Symmetry codes: (ii) −x+1, −y, −z+1; (iii) x+1/2, −y+1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C17H15IO2S |
Mr | 410.25 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 173 |
a, b, c (Å) | 10.1034 (3), 13.1942 (4), 11.9933 (3) |
β (°) | 92.634 (1) |
V (Å3) | 1597.09 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.14 |
Crystal size (mm) | 0.32 × 0.27 × 0.09 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.551, 0.834 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15129, 3667, 3366 |
Rint | 0.025 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.026, 0.069, 1.07 |
No. of reflections | 3667 |
No. of parameters | 192 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.96, −0.69 |
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 C2–C7 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C16—H16B···O2i | 0.97 | 2.60 | 3.341 (3) | 133.5 |
C11—H11···Cgii | 0.93 | 2.61 | 3.378 (3) | 140.9 |
Symmetry codes: (i) −x+1, −y, −z+1; (ii) x+1/2, −y+1/2, z+1/2. |
References
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The benzofuran ring system show interesting pharmacological properties such as antifungal (Aslam et al., 2006), antitumor and antiviral (Galal et al., 2009), antimicrobial (Khan et al., 2005) activities. These compounds widely occur in nature (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our continuing studies of the substituent effect on the solid state structures of 3-ethylsulfinyl-5-halo-2-(4-halophenyl)-1-benzofuran analogues (Choi et al., 2010a,b,c), we report the crystal structure of the title compound (Fig. 1).
The benzofuran unit is essentially planar, with a mean deviation of 0.021 (2) Å from the least-squares plane defined by the nine constituent atoms. The dihedral angle formed by the benzofuran plane and the 4-iodophenyl ring is 35.39 (8)°. The crystal packing (Fig. 2) is stabilized by a weak intermolecular C—H···O hydrogen bond between the methylene H atom of the ethyl group and the oxygen of the S═O unit, with a C16—16B···O2i (Table 1), and by an I···O halogen-bonding between the iodine and the oxygen of the S═O unit [I···O2iii = 3.378 (2) Å; C12—I···O2iii = 162.46 (7)°] (Politzer et al., 2007). The molecular packing (Fig. 3) is further stabilized by an intermolecular C—H···π interaction between the 4-iodophenyl H atom and the benzene ring of a neighbouring molecule, with a C11—H11···Cgii (Table 1), and by an aromatic π–π interaction between the benzene rings of neighbouring molecules, with a Cg···Cgv distance of 3.495 (3) Å (Cg is the centroid of the C2–C7 benzene ring).