Novel 1,2,4-Triphosphole and 1,2,3-Triphosphetene Derivatives fromN,N′-Bis(2,2-dimethylpropyl)benzimidazolin-2-ylidene and Phosphaalkynes

In a one-pot synthesis, the phosphorus hetereocycle 1 is formed quantitatively by reaction of an annelated nucleophilic carbene with PCN(iPr)2 produces the 1,2,3-triphosphetene 2, which contains two double bonds with an N,N,N,P-substitution pattern not previously reported.