(2,5-Diphenylpent-4-yn-1-en-3-ylidene)triphenylphosphorane

The title compound, C45H27P, was obtained as a product of the reaction of triphenylmethylenephosphorane with one molar equivalent of 1,4-diphenylbutadiyne in toluene. The compound was very stable under ambient conditions, but rapidly decomposed in solution when exposed to the air. The P atom is tetracoordinated in an approximately tetrahedral geometry. The length of the C[triple-bond]C triple bond [1.206 (2) Å] is in the normal range.

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