Synthese kationischer η2‐Phosphinocarben‐Komplexe des Molybdäns und Wolframs

Abstract

Synthesis of Cationic η2‐Phosphinocarbene Complexes of Molybdenum and TungstenHerrn Professor Hubert Schmidbaur zum 60. Geburtstag gewidmet. The reaction of chlordimethylphosphane or chlordiphenyl‐phosphane and sodium tetraphenylborate with dicarbonyl(η5‐cyclopentadienyl)carbyne complexes of molybdenum and tungsten enables the direct conversion of a MCR group into a MC(R)PR2 unit providing dicarbonyl substituted η2‐phosphinocarbene complexes in high yields. In the absence of Na[BPh4] a base induced carbonyl carbene coupling reaction affords η3‐phosphinoketene complexes.