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The Wittig reaction of aromatic p-substituted bisphosphoranes with bisaldehydes was carried out in dimethylformamide to give four kinds of poly-p-xylylidene series, as the oligopolymers in good yield. In the process of the reaction, the cyclic olefins were also given in very poor yield.

Reaction of Aromatic <I>p</I>-Substituted Bisphosphoranes with Bisaldehydes