First Synthesis and Structures of 2H-1,3,2-Diazaphosphole Tungsten Complexes

Abstract:

Thermal decomposition of a 2H-azaphosphirene tungsten complex in the presence of various nitrile derivatives yielded 2H-1,3,2-diazaphosphole tungsten complexes. The overall reaction may be described as a 1,3-dipolar cycloaddition of an in situ generated nitrilium phosphan eylide complex with a nitrile moiety. First evidence for a nitrile /nitrile substitution reaction leading to transiently formed nitrilium phos-phane ylide complexes and a novel access to dialkylamino-substituted 2H-azaphosphirene tungsten complexes are reported.

Keywords::

• phosphorus heterocycles
• cycloaddition reactions
• diazaphosphole complexes
• azaphosphirene complexes
• nitrilium phosphane ylide complexes
• phosphanediyl complexes