Remarkable metal-complexed phosphorus analogues of the cyclopropenylcarbene-cyclobutadiene rearrangement.

In situ-generated metal carbonyl-complexed cyclopropenylphosphinidenes undergo a sequence of structural changes leading to phosphorus analogues of Pettit's seminal (η(4)-cyclobutadiene)iron tricarbonyl complex via multiple valence isomers along the reaction pathway and the elimination of one molecule of carbon monoxide.

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