Surprising reactions of a 2H-azaphosphirene complex with a silylene

Reaction of the 2H-azaphosphirene complex 1 with the silylene 5 yielded the bicyclic carbene complex 9 as sole product at ambient temperature; the reaction was less selective at elevated temperatures; additionally, the synthesis and structure of the first 1,2,4,3-azadiphosphasilol-5-ene complex 11 is presented.