1,1,2,2-Tetrakis[2,4-dichloro-6-(diethoxymethyl)phenoxymethyl]ethene

In the title compound, C50H60Cl8O12, the molecules are disordered about an inversion center located at the mid-point of the central C=C bond. These atoms show disorder and were modelled with two different orientations with site occupancies of 0.828 (3) and 0.172 (3). The dihedral angle between the two benzene rings in the asymmetric unit is 52.80 (6)°. Intramolecular C—H⋯O and C—H⋯Cl interactions occur and the crystal packing features inversion dimers linked by pairs of C—H⋯O bonds, generating R 2 2(10) loops.


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The title compound, (Fig. 1), lies on an inversion centre, giving one half-molecule per asymmetric unit which passes through middle point of the C13=C13A double bond of the aliphatic chain. Atoms C12 C13 and C14 atoms show disorder and were modelled with two different orientations and with site occupancies of 0.828 (4):0.172 (4). The (diethoxymethyl)benzene groups adopts an all-trans conformation and the molecular structure is not planar. The O3 C12 C13 C14 and C12 C13 C14 O6 torsion angles are 68.6 (2) ° and 82.5 (2) ° and the dihedral angle between the planes of the benzene rings (C1/C6 to C15/C20) is 52.80 (6) ° [for the non-H atoms, maximum deviation = 0.007 (1) Å for C2]. Bond lengths and angles can be regarded as normal for such structures (Öztürk Yildirim et al. 2012;Allen, 2002). No classical hydrogen bonds are observed in the crystal structure.

Experimental
Title compound was published methods (Er et al., 2009). Crystals were grown by slow evaporation of an dimethylformamide/alcohol mixed solution.

Refinement
The hydrogen atoms were placed in calculated positions with C-H = 0.95-0.99 Å and refined using a riding model with fixed isotropic displacement parameters [U iso (H) = 1.5U eq (C) for the methyl groups and 1.2U eq (C) for the other H atoms].
The molecules are disordered about an inversion center, therefore, the O1-C12/C12-C13 and C13-C14/C14-O1 distances are average values. The SIMU and DELU constraint instructions in SHELXL97 were used atom C13 in order to model the disorder properly during the refinement. For C13B the ISOR instruction was used as otherwise it went non-supplementary materials sup-2 . E68, o2993-o2994 positive definite. The displacement parameters of the pairs C12/C12B and C14/C14B were set equal using the EADP instruction.

Figure 1
The molecular structure of (I) showing displacement ellipsoids at the 50% probability level [symmetry code:  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.