organic compounds
(E)-1-(Furan-2-yl)-3-(2,4,5-trimethoxyphenyl)prop-2-en-1-one
aCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, bExcellence Center, Mae Fah Luang University, Thasud, Muang, Chaing Rai 57100, Thailand, and cX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: suchada.c@psu.ac.th
In the title chalcone derivative, C16H16O5, the dihedral angle between the furan and benzene rings is 2.06 (17)°. The two methoxy groups at the ortho and para positions are essentially coplanar with the benzene ring [C—O—C—C angles = −1.0 (5) and 178.5 (3)°], whereas the third one at the meta position is slightly twisted [C—O—C—C = 9.6 (5)°]. In the crystal, weak C—H⋯O interactions link the molecules into a sheet parallel to (02). An intermolecular π–π interaction between the furan and benzene rings is present [centroid–centroid distance = 3.772 (2) Å]. A short C⋯C contact [3.173 (5) Å] is also observed between neighbouring furan rings.
Related literature
For background to and applications of et al. (2008); Jung et al. (2008); Lee et al. (2006); Liu et al. (2011); Nerya et al. (2004); Suwunwong et al. (2011); Tewtrakul et al. (2003). For related structures, see: Fun et al. (2010a,b, 2011). For the stability of the temperature controller, see: Cosier & Glazer, (1986). For standard bond-length data, see: Allen et al. (1987).
see: ChengExperimental
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: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
10.1107/S1600536812000037/is5037sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812000037/is5037Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812000037/is5037Isup3.cml
The title compound was prepared by the condensation of the solution of 2-furyl methylketone (2 mmol, 0.22 g) in ethanol (15 ml) with the solution of 2,4,5-trimethoxybenzaldehyde (2 mmol, 0.40 g) in ethanol (15 ml) in the presence of 20% NaOH (aq) 5 ml at 278 K for 4 hr. The resulting solid which was obtained was collected by filtration, washed with distilled water and dried in air. Yellow slab-shaped single crystals of the title compound suitable for X-ray
were recrystalized from acetone:ethanol (1:1 v/v) by the slow evaporation of the solvent at room temperature after several days (m.p. 356–357 K).All H atoms were positioned geometrically and allowed to ride on their parent atoms, with d(C—H) = 0.93 Å for aromatic and CH, and 0.96 Å for CH3 atoms. The Uiso(H) values were constrained to be 1.5Ueq of the
for methyl H atoms and 1.2Ueq for the remaining H atoms. A rotating group model was used for the methyl groups. The highest residual electron density peak is located at 0.83 Å from C10 and the deepest hole is located at 0.89 Å from C4.Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).C16H16O5 | F(000) = 608 |
Mr = 288.29 | Dx = 1.414 Mg m−3 |
Monoclinic, P21/c | Melting point = 356–357 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 8.338 (2) Å | Cell parameters from 2647 reflections |
b = 8.610 (2) Å | θ = 2.2–26.0° |
c = 18.923 (5) Å | µ = 0.11 mm−1 |
β = 94.467 (4)° | T = 100 K |
V = 1354.4 (6) Å3 | Plate, yellow |
Z = 4 | 0.28 × 0.21 × 0.09 mm |
Bruker APEX DUO CCD area-detector diffractometer | 2647 independent reflections |
Radiation source: sealed tube | 1663 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.068 |
ϕ and ω scans | θmax = 26.0°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −8→10 |
Tmin = 0.971, Tmax = 0.991 | k = −10→7 |
8001 measured reflections | l = −23→23 |
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)] = 0.064 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.175 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0653P)2 + 1.5283P] where P = (Fo2 + 2Fc2)/3 |
2647 reflections | (Δ/σ)max = 0.001 |
193 parameters | Δρmax = 0.33 e Å−3 |
0 restraints | Δρmin = −0.40 e Å−3 |
C16H16O5 | V = 1354.4 (6) Å3 |
Mr = 288.29 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.338 (2) Å | µ = 0.11 mm−1 |
b = 8.610 (2) Å | T = 100 K |
c = 18.923 (5) Å | 0.28 × 0.21 × 0.09 mm |
β = 94.467 (4)° |
Bruker APEX DUO CCD area-detector diffractometer | 2647 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 1663 reflections with I > 2σ(I) |
Tmin = 0.971, Tmax = 0.991 | Rint = 0.068 |
8001 measured reflections |
R[F2 > 2σ(F2)] = 0.064 | 0 restraints |
wR(F2) = 0.175 | H-atom parameters constrained |
S = 1.08 | Δρmax = 0.33 e Å−3 |
2647 reflections | Δρmin = −0.40 e Å−3 |
193 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
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 | ||
O1 | 0.8947 (3) | 1.0580 (3) | 0.56583 (11) | 0.0221 (6) | |
O2 | 0.8198 (3) | 0.6581 (3) | 0.53014 (11) | 0.0219 (6) | |
O3 | 0.5846 (3) | 1.3849 (3) | 0.41496 (11) | 0.0234 (6) | |
O4 | 0.1930 (3) | 1.2112 (3) | 0.22782 (11) | 0.0203 (6) | |
O5 | 0.2463 (3) | 0.9265 (3) | 0.26329 (11) | 0.0211 (6) | |
C1 | 0.8927 (5) | 0.5329 (4) | 0.56403 (17) | 0.0249 (9) | |
H1A | 0.8673 | 0.4297 | 0.5539 | 0.030* | |
C2 | 1.0063 (4) | 0.5797 (4) | 0.61407 (17) | 0.0244 (9) | |
H2A | 1.0717 | 0.5167 | 0.6440 | 0.029* | |
C3 | 1.0061 (4) | 0.7441 (4) | 0.61196 (17) | 0.0218 (8) | |
H3A | 1.0719 | 0.8098 | 0.6404 | 0.026* | |
C4 | 0.8920 (4) | 0.7884 (4) | 0.56070 (15) | 0.0177 (7) | |
C5 | 0.8371 (4) | 0.9414 (4) | 0.53558 (15) | 0.0181 (8) | |
C6 | 0.7141 (4) | 0.9497 (4) | 0.47546 (15) | 0.0177 (8) | |
H6A | 0.6743 | 0.8590 | 0.4539 | 0.021* | |
C7 | 0.6597 (4) | 1.0876 (4) | 0.45188 (16) | 0.0174 (8) | |
H7A | 0.7039 | 1.1740 | 0.4756 | 0.021* | |
C8 | 0.5399 (4) | 1.1191 (4) | 0.39374 (15) | 0.0157 (7) | |
C9 | 0.5031 (4) | 1.2735 (4) | 0.37474 (16) | 0.0172 (8) | |
C10 | 0.3898 (4) | 1.3086 (4) | 0.31901 (15) | 0.0162 (7) | |
H10A | 0.3691 | 1.4115 | 0.3065 | 0.019* | |
C11 | 0.3084 (4) | 1.1903 (4) | 0.28248 (15) | 0.0145 (7) | |
C12 | 0.3391 (4) | 1.0334 (4) | 0.30161 (15) | 0.0152 (7) | |
C13 | 0.4544 (4) | 1.0014 (4) | 0.35535 (15) | 0.0155 (7) | |
H13A | 0.4769 | 0.8982 | 0.3668 | 0.019* | |
C14 | 0.5532 (5) | 1.5429 (4) | 0.39800 (19) | 0.0317 (10) | |
H14B | 0.6202 | 1.6080 | 0.4291 | 0.048* | |
H14C | 0.4421 | 1.5656 | 0.4036 | 0.048* | |
H14D | 0.5759 | 1.5621 | 0.3498 | 0.048* | |
C15 | 0.1539 (4) | 1.3692 (4) | 0.20725 (16) | 0.0190 (8) | |
H15C | 0.0763 | 1.3687 | 0.1670 | 0.029* | |
H15D | 0.2495 | 1.4216 | 0.1951 | 0.029* | |
H15A | 0.1098 | 1.4221 | 0.2460 | 0.029* | |
C16 | 0.2548 (5) | 0.7704 (4) | 0.28869 (17) | 0.0234 (8) | |
H16D | 0.1717 | 0.7097 | 0.2640 | 0.035* | |
H16A | 0.2406 | 0.7694 | 0.3385 | 0.035* | |
H16B | 0.3580 | 0.7272 | 0.2806 | 0.035* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0219 (15) | 0.0236 (14) | 0.0194 (11) | −0.0015 (11) | −0.0062 (10) | −0.0033 (10) |
O2 | 0.0214 (15) | 0.0215 (14) | 0.0214 (11) | 0.0010 (11) | −0.0076 (10) | 0.0023 (10) |
O3 | 0.0271 (16) | 0.0136 (13) | 0.0269 (12) | −0.0014 (11) | −0.0148 (11) | 0.0006 (10) |
O4 | 0.0225 (15) | 0.0167 (13) | 0.0198 (11) | 0.0022 (11) | −0.0106 (10) | 0.0018 (9) |
O5 | 0.0236 (15) | 0.0138 (13) | 0.0239 (11) | −0.0038 (11) | −0.0105 (10) | −0.0012 (9) |
C1 | 0.029 (2) | 0.0191 (19) | 0.0261 (17) | 0.0075 (18) | 0.0009 (16) | 0.0063 (15) |
C2 | 0.020 (2) | 0.033 (2) | 0.0205 (16) | 0.0054 (17) | 0.0015 (15) | 0.0070 (15) |
C3 | 0.016 (2) | 0.030 (2) | 0.0187 (15) | −0.0001 (16) | −0.0019 (14) | 0.0027 (14) |
C4 | 0.0135 (19) | 0.0238 (19) | 0.0153 (14) | −0.0026 (16) | −0.0016 (13) | −0.0002 (14) |
C5 | 0.015 (2) | 0.024 (2) | 0.0155 (15) | 0.0011 (16) | −0.0012 (13) | 0.0006 (14) |
C6 | 0.014 (2) | 0.0200 (19) | 0.0183 (15) | −0.0021 (15) | −0.0049 (13) | −0.0002 (13) |
C7 | 0.0129 (19) | 0.0218 (19) | 0.0174 (15) | −0.0026 (14) | 0.0011 (13) | −0.0004 (13) |
C8 | 0.0157 (19) | 0.0169 (18) | 0.0140 (14) | −0.0004 (15) | −0.0018 (13) | 0.0002 (13) |
C9 | 0.0143 (19) | 0.0176 (18) | 0.0189 (15) | −0.0029 (15) | −0.0032 (14) | −0.0008 (13) |
C10 | 0.0144 (19) | 0.0155 (18) | 0.0184 (15) | 0.0016 (15) | 0.0000 (13) | 0.0022 (13) |
C11 | 0.0096 (18) | 0.0189 (18) | 0.0146 (14) | 0.0037 (14) | −0.0017 (13) | 0.0016 (13) |
C12 | 0.0115 (18) | 0.0181 (18) | 0.0155 (14) | −0.0002 (15) | −0.0023 (13) | −0.0017 (13) |
C13 | 0.0132 (19) | 0.0161 (18) | 0.0166 (15) | 0.0008 (14) | −0.0035 (13) | 0.0006 (12) |
C14 | 0.044 (3) | 0.0117 (19) | 0.036 (2) | −0.0027 (19) | −0.0158 (18) | 0.0021 (16) |
C15 | 0.019 (2) | 0.0172 (18) | 0.0196 (15) | 0.0027 (15) | −0.0046 (14) | 0.0063 (13) |
C16 | 0.029 (2) | 0.0140 (19) | 0.0259 (17) | −0.0021 (16) | −0.0058 (15) | −0.0004 (14) |
O1—C5 | 1.234 (4) | C7—C8 | 1.453 (5) |
O2—C1 | 1.372 (4) | C7—H7A | 0.9300 |
O2—C4 | 1.379 (4) | C8—C9 | 1.405 (5) |
O3—C9 | 1.371 (4) | C8—C13 | 1.408 (4) |
O3—C14 | 1.418 (4) | C9—C10 | 1.393 (5) |
O4—C11 | 1.369 (4) | C10—C11 | 1.379 (5) |
O4—C15 | 1.445 (4) | C10—H10A | 0.9300 |
O5—C12 | 1.373 (4) | C11—C12 | 1.416 (5) |
O5—C16 | 1.427 (4) | C12—C13 | 1.372 (4) |
C1—C2 | 1.347 (5) | C13—H13A | 0.9300 |
C1—H1A | 0.9300 | C14—H14B | 0.9600 |
C2—C3 | 1.416 (5) | C14—H14C | 0.9600 |
C2—H2A | 0.9300 | C14—H14D | 0.9600 |
C3—C4 | 1.359 (5) | C15—H15C | 0.9600 |
C3—H3A | 0.9300 | C15—H15D | 0.9600 |
C4—C5 | 1.462 (5) | C15—H15A | 0.9600 |
C5—C6 | 1.473 (4) | C16—H16D | 0.9600 |
C6—C7 | 1.335 (5) | C16—H16A | 0.9600 |
C6—H6A | 0.9300 | C16—H16B | 0.9600 |
C1—O2—C4 | 106.3 (3) | C11—C10—C9 | 119.9 (3) |
C9—O3—C14 | 118.1 (3) | C11—C10—H10A | 120.1 |
C11—O4—C15 | 117.3 (3) | C9—C10—H10A | 120.1 |
C12—O5—C16 | 116.2 (3) | O4—C11—C10 | 124.8 (3) |
C2—C1—O2 | 110.8 (3) | O4—C11—C12 | 114.9 (3) |
C2—C1—H1A | 124.6 | C10—C11—C12 | 120.2 (3) |
O2—C1—H1A | 124.6 | C13—C12—O5 | 126.2 (3) |
C1—C2—C3 | 106.3 (3) | C13—C12—C11 | 118.9 (3) |
C1—C2—H2A | 126.9 | O5—C12—C11 | 114.9 (3) |
C3—C2—H2A | 126.9 | C12—C13—C8 | 122.3 (3) |
C4—C3—C2 | 107.4 (3) | C12—C13—H13A | 118.8 |
C4—C3—H3A | 126.3 | C8—C13—H13A | 118.8 |
C2—C3—H3A | 126.3 | O3—C14—H14B | 109.5 |
C3—C4—O2 | 109.2 (3) | O3—C14—H14C | 109.5 |
C3—C4—C5 | 132.0 (3) | H14B—C14—H14C | 109.5 |
O2—C4—C5 | 118.8 (3) | O3—C14—H14D | 109.5 |
O1—C5—C4 | 118.8 (3) | H14B—C14—H14D | 109.5 |
O1—C5—C6 | 122.7 (3) | H14C—C14—H14D | 109.5 |
C4—C5—C6 | 118.5 (3) | O4—C15—H15C | 109.5 |
C7—C6—C5 | 120.0 (3) | O4—C15—H15D | 109.5 |
C7—C6—H6A | 120.0 | H15C—C15—H15D | 109.5 |
C5—C6—H6A | 120.0 | O4—C15—H15A | 109.5 |
C6—C7—C8 | 128.0 (3) | H15C—C15—H15A | 109.5 |
C6—C7—H7A | 116.0 | H15D—C15—H15A | 109.5 |
C8—C7—H7A | 116.0 | O5—C16—H16D | 109.5 |
C9—C8—C13 | 117.2 (3) | O5—C16—H16A | 109.5 |
C9—C8—C7 | 119.6 (3) | H16D—C16—H16A | 109.5 |
C13—C8—C7 | 123.1 (3) | O5—C16—H16B | 109.5 |
O3—C9—C10 | 123.1 (3) | H16D—C16—H16B | 109.5 |
O3—C9—C8 | 115.5 (3) | H16A—C16—H16B | 109.5 |
C10—C9—C8 | 121.4 (3) | ||
C4—O2—C1—C2 | 0.1 (4) | C7—C8—C9—O3 | −1.1 (4) |
O2—C1—C2—C3 | −0.1 (4) | C13—C8—C9—C10 | −1.6 (5) |
C1—C2—C3—C4 | 0.1 (4) | C7—C8—C9—C10 | 179.5 (3) |
C2—C3—C4—O2 | 0.0 (4) | O3—C9—C10—C11 | −177.7 (3) |
C2—C3—C4—C5 | 179.1 (3) | C8—C9—C10—C11 | 1.6 (5) |
C1—O2—C4—C3 | 0.0 (3) | C15—O4—C11—C10 | −0.1 (4) |
C1—O2—C4—C5 | −179.3 (3) | C15—O4—C11—C12 | 178.5 (3) |
C3—C4—C5—O1 | −3.5 (5) | C9—C10—C11—O4 | 178.8 (3) |
O2—C4—C5—O1 | 175.6 (3) | C9—C10—C11—C12 | 0.3 (4) |
C3—C4—C5—C6 | 177.0 (3) | C16—O5—C12—C13 | 9.6 (5) |
O2—C4—C5—C6 | −3.9 (4) | C16—O5—C12—C11 | −170.0 (3) |
O1—C5—C6—C7 | −0.4 (5) | O4—C11—C12—C13 | 179.2 (3) |
C4—C5—C6—C7 | 179.1 (3) | C10—C11—C12—C13 | −2.1 (4) |
C5—C6—C7—C8 | 179.9 (3) | O4—C11—C12—O5 | −1.1 (4) |
C6—C7—C8—C9 | −177.3 (3) | C10—C11—C12—O5 | 177.6 (3) |
C6—C7—C8—C13 | 4.0 (5) | O5—C12—C13—C8 | −177.5 (3) |
C14—O3—C9—C10 | −1.0 (5) | C11—C12—C13—C8 | 2.1 (5) |
C14—O3—C9—C8 | 179.6 (3) | C9—C8—C13—C12 | −0.2 (5) |
C13—C8—C9—O3 | 177.7 (3) | C7—C8—C13—C12 | 178.5 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O2i | 0.96 | 2.47 | 3.363 (5) | 154 |
C15—H15C···O1ii | 0.96 | 2.43 | 3.365 (4) | 165 |
Symmetry codes: (i) x, y+1, z; (ii) x−1, −y+5/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C16H16O5 |
Mr | 288.29 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 8.338 (2), 8.610 (2), 18.923 (5) |
β (°) | 94.467 (4) |
V (Å3) | 1354.4 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.11 |
Crystal size (mm) | 0.28 × 0.21 × 0.09 |
Data collection | |
Diffractometer | Bruker APEX DUO CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.971, 0.991 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8001, 2647, 1663 |
Rint | 0.068 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.064, 0.175, 1.08 |
No. of reflections | 2647 |
No. of parameters | 193 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.33, −0.40 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O2i | 0.96 | 2.47 | 3.363 (5) | 154 |
C15—H15C···O1ii | 0.96 | 2.43 | 3.365 (4) | 165 |
Symmetry codes: (i) x, y+1, z; (ii) x−1, −y+5/2, z−1/2. |
Acknowledgements
The authors thank the Thailand Research Fund (grant No. RSA5280033) and the Prince of Songkla University for financial support. TS thanks the Graduate School, Prince of Songkla University, for partial financial support. The authors also thank Universiti Sains Malaysia for the Research University Grant No. 1001/PFIZIK/811160.
References
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Chalcones and heteroaryl chalcones have been reported to possess a wide range of biological activities such as antibacterial (Liu et al., 2011), anti-inflammatory (Lee et al., 2006), anti-oxidant (Cheng et al., 2008), HIV-1 protease inhibitory (Tewtrakul et al., 2003) as well as anti-tyrosinase activities (Nerya et al., 2004), including fluorescent property (Jung et al., 2008; Suwunwong et al., 2011). The title heteroaryl chalcones (I) was synthesized to study for its fluorescence property and tyrosinase inhibitory activity and also to compare its property with the previously published related compounds (Suwunwong et al., 2011). Our experiment shows that (I) exhibits fluorescence property (Suwunwong et al., 2011) and tyrosinase inhibitory activity with the IC50 value of 0.143±0.002 mg.ml-1. Herein the crystal structure of (I) is reported.
The molecule of (I) in Fig. 1 exists in an E configuration with respect to the C6═C7 double bond [1.335 (5) Å]. The molecule is planar with the dihedral angle between the furan and the benzene rings being 2.06 (17)°. The middle prop-2-en-1-one unit (O2/C5–C7) is also planar with the r.m.s. 0.0013 (2) and the torsion angle O1–C5–C6–C7 = -0.4 (5)°. The mean plane through this unit makes dihedral angles of 4.1 (2)° and 3.6 (2)° with the furan and the benzene rings, respectively. The two methoxy groups at ortho (at atom 9) and para (at atom C11) positions of 2,4,5-trimethoxyphenyl unit are essentially co-planar with the attached benzene ring with torsion angles C14–O3–C9–C10 = -1.0 (5)° and C15–O4–C11–C12 = 178.5 (3)°, whereas the third one at meta (at atom C12) position is slightly twisted with the torsion angle of C16–O5–C12–C13 = 9.6 (5)°. These angle values also indicated that the methyl group at para position points toward the one at ortho but point away from the one at meta positions due to the sterric effect. The bond distances have normal values (Allen et al., 1987) and are comparable with closely related structures (Fun et al., 2010a,b, 2011).
In the crystal packing (Fig. 2), weak C14—H14B···O2i and C15—H15C···O1ii interactions (Table 1) link the molecules into sheets parallel to the (1 0 2) plane and these sheets are stacked along the a axis by π–π interactions with Cg1···Cg2iii = 3.772 (2) Å [symmetry code: (iii) 1-x, 2-y, 1-z]; Cg1 and Cg2 are the centroids of C1–C4/O2 furan and C8–C13 benzene rings, respectively. A C1···C1iv[3.173 (5) Å; symmetry code: (iv) 2-x, 1-y, 1-z] short contact is also observed.