REACTIONS OF STABLE (PHOSPHINO) (SILYL) CARBENES WITH IMINOPHOSPHINES

[(Dialkylamino) (2,2,6,6-tetramethylpiperidino)phosphino] (trimethylsi lyl)carbenes 1 and 2 react with [(2,4,6-tritert-butylphenyl)imino]phos phines bearing different substituents at phosphorus, 3a-e, leading to methylenephosphine-iminophosphoranes 4a-e. With P-chloro and P-bromo i minophosphines 3d,e, besides the formation of 4d,e, a small amount of the isomeric methylenephosphorane-iminophosphines 6d,e was obtained. I n contrast, [bis(dicyclohexylamino)phosphino] trimethylsilyldiazometha ne 7 reacts with iodo [(2,4,6-tri-tert-butylphenyl)imino]phosphine 3f to give triazaphosphole 8. These results demonstrate the carbene behav ior of phosphino(silyl)carbenes and bring further evidence of the synt hetic importance of stable carbenes.