1-Cyclohexyl-6,7-dimethoxy-1,4-dihydronaphthalene

The title compound, C18H24O2, was isolated from the leaves extract of Ficus carica L. The cyclohexane ring displays a chair conformation whereas the cyclohexa-1,4-diene ring adopts a flattened boat conformation with methyl C atoms at the prow and stern. In the crystal, molecules are linked by weak C—H⋯O hydrogen bonds into supramolecular chains propagated along the b-axis direction.

The title compound, C 18 H 24 O 2 , was isolated from the leaves extract of Ficus carica L. The cyclohexane ring displays a chair conformation whereas the cyclohexa-1,4-diene ring adopts a flattened boat conformation with methyl C atoms at the prow and stern. In the crystal, molecules are linked by weak C-HÁ Á ÁO hydrogen bonds into supramolecular chains propagated along the b-axis direction.   Table 1 Hydrogen-bond geometry (Å , ).
Diffraction data was collected at the Analytical Center of the Chemistry Department of Zhejiang University, China.

Comment
Ficus carica L. is a deciduous tree belonging to the Moraceae family. Different biologically activity compounds have been isolated from this plant (Joseph & Raj, 2011). The leaf extracts of Ficus carica L. show the potential activity of inhibit the growth of the cancer cell, antioxidative and antibiosis (Xie & Zhuang, 2010;Fang et al., 2008). The title compound is one of leaves extracts from Ficus carica L.
In the title compound, the cyclohexane ring displays the chair conformation whereas the cyclohexadiene ring adopts the flattened boat conformation with the methyl-C atoms (C7 and C10) on the prow and stern, respectively. In the crystal, the molecules are linked by weak C-H···O hydrogen bonds into the supramolecular chains running along the b-axis direction.

Experimental
The leaves of Ficus carica was be extracted by petroleum ether. The upper phase was filtered and evaporated in vacuo to obtain the crystals. The single crystals were recrystallized from a hexane solution.

Refinement
H atoms were placed in calculated positions with C-H = 0.93-0.98 Å, and refined in riding mode with U iso (H) = 1.5U eq (C) for methyl H atoms and 1.2U eq (C) for the others.  The molecular structure of (I) with 30% probability displacement ellipsoids (arbitrary spheres for H atoms). where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.10 e Å −3 Δρ min = −0.10 e Å −3 Extinction correction: SHELXTL (Sheldrick, 2008), Fc * =kFc[1+0.001xFc 2 λ 3 /sin(2θ)] -1/4 Extinction coefficient: 0.0191 (17) Special details 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 F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.