P. Molina et al., REACTION OF ALLYL IMINOPHOSPHORANES WITH KETENES AND ACYL CHLORIDES -ONE-POT PREPARATION OF 4-PENTENENITRILES, Tetrahedron, 49(23), 1993, pp. 5153-5168
One-pot conversion of allyl azides into 4-pentenenitriles 4 is achieve
d by sequential treatment of allyl azides with triphenylphosphine and
the corresponding ketene under mild and neutral conditions. On the oth
er hand, allyl iminophosphoranes and related react with arylacetic aci
d chlorides to give unexpectedly the phosphonium salts 5 which by trea
tment with base and then heating lead to 4-pentenenitriles 9.