4,4′-Bis(2-methoxylstyryl)biphenyl

The title compound, C30H26O2, was prepared by the reaction of a Wittig reagent and 2-methoxybenzaldehyde. The molecule lies about an inversion centre located at the midpoint of the C—C bond between the inner benzene rings. The crystal structure is stabilized by C—H⋯π interactions.

The title compound, C 30 H 26 O 2 , was prepared by the reaction of a Wittig reagent and 2-methoxybenzaldehyde. The molecule lies about an inversion centre located at the midpoint of the C-C bond between the inner benzene rings. The crystal structure is stabilized by C-HÁ Á Á interactions.

D-HÁ
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: AT2831). such as the optics characteristic. (Song et al., 2003). As part of our search for new ethylene biphenyl compounds we synthesized the title compound (I), and describe its structure here.
As shown in Fig. 1, the molecule has an inversion centre lied on the midpoint of the C-C bond between the inner benzene rings. The C8-C9 bond length of 1.314 (4)Å is comparable with C-C double bond [1.336 (2) Å] reported (Trueblood et al., 1982).
In the structure, there is no classcial hydrogen bonds. The crystal structure is stabilized by C-H···π interactions (Table   1).

S2. Experimental
A mixture of the Wittig-reagent (0.1 mol), and 2-methoxybenzaldehyde (0.2 mol) was stirred in refluxing N,N-dimethylformamide (20 mL) for 4 h to afford the title compound (0.084 mol, yield 84%). Single crystals suitable for X-ray measurements were obtained by recrystallization from ethanol at room temperature.

S3. Refinement
H atoms were fixed geometrically and allowed to ride on their attached atoms, with C-H = 0.93 -0.96 Å, and with U iso (H) =1.2 or 1.5U eq (C).

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.