Acta Cryst. (2002). E58, o1195-o1197  [ doi:10.1107/S1600536802017713 ]

r-1,c-2,t-3,t-4-1,2-Bis(4-methoxyphenyl)-3,4-bis(5-phenyl-1,3,4-oxadiazol-2-yl)cyclobutane

J.-P. Zhuang and Y. Zheng

Abstract: The title compound, C₃₄H₂₈N₄O₄, is a derivative of diphenyloxadiazolylcyclobutane (s-DPC), and although it is a syn-head-to-head photodimer, it does not display molecular mirror symmetry in the crystalline state. The cyclobutane ring has a puckered conformation, with a dihedral angle of 30°, which is the largest among tetraaryl-substituted cyclobutanes reported so far. The four C-C single bonds of the cyclobutane ring differ from each other. One is the same length as a typical C-C single bond, while the others are longer. The photodimerization of the corresponding monomer yields only 1% of s-DPC, suggesting that the head-to-head reaction is a minor photodimerization process.

Online 5 October 2002

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