ALLENYL AND DIVINYL PHOSPHINES, ARSINES, AND STIBINES AS POTENTIAL PRECURSORS OF THE CORRESPONDING 1-PHOSPHA AND 2-PHOSPHA, 1-ARSA AND 2-ARSA, AND 1-STIBA AND 2-STIBA DIENES

The base-induced rearrangement of divinylphosphine led to the correspo nding 3-phospha-1,3-pentadiene, which is sufficiently stable to be det ected at room temperature by P-31 NMR spectroscopy. This diene was tra pped by addition of 2-propanethiol to the reaction mixture. Under simi lar conditions, the transient 1-phospha-1,3-butadiene and 3-arsa-1,3-p entadiene were chemically trapped. Divinylstibine and allenylstibine, both new compounds and potential precursors of stibadienes, were also prepared.