Preparation of vinylphosphines by means of free radical addition of diphenylphosphine to alkynes and allenes

Article abstract of DOI:10.1016/0022-328X(91)86141-C

Diphenylphosphine adds readily to alkynes and allenes under free radical conditions.Alkynes normally give E-vinylphosphines as the primary (kinetic) product, but Z-vinylphosphines are the main products isolated.Allenes generally give complex product mixtures in which the predominant components are vinyl phosphines formed via addition of the Ph2P^. radical to the central carbon atom of the allene fragment.