Restricted rotation about the aliphatic carbon–carbon bond in 1,2-disubstituted tetra-arylethanes

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Abstract
The existence of stable rotational isomers of 1,2-dichlorotetraphenylethane previously reported, is shown to be incorrect, since dipole moment measurements indicate the presence of the trans-form only. Infrared studies of a number of 1,2-disubstituted tetra-arylethanes fail to account for the existence of possible gauche-forms, except in the case of the ethane-1,2-diols which occur exclusively in this conformation. Chlorine addition reactions with sulphuryl chloride as reagent follow a heterolytic path.

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