Reactions of phosphines with acetylenes. Part V. Structure revision of a so-called phosphole. A stable alkylidene-1,6-diphosphorane

Abstract
Dicyanoacetylene and triphenylphosphine react to form a stable adduct, which has been shown to be an alkylidene-1,6-diphosphorane, rather than a stable phosphole as previously postulated. The relative ease of protonation of phosphoranes stabilised by ester and nitrile functions is discussed.

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