(1Z,3Z)-1,4-Diphenyl-1,4-bis(3-chlorophenylmethylthio)buta-1,3-diene

The crystal structure of the title compound, C₃₀H₂₄Cl₂S₂, (I), is described and compared with that of (1Z,3Z)-1,4-diphenyl-1,4-bis(p-tolylmethylenethio)buta-1,3-diene, (II). The 1,3-butadiene moiety in compound (I) has a planar s-trans conformation with the planes of the two phenyl rings tilted 32.8° from the 1,3-butadiene plane. The relatively short C-C single bond and C=C double bond in (I) may be attributed to delocalization (resonance) over the planar four carbon unit and to hybridization changes.

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