An access to base-stabilized three-membered silicon heterocycles

The three-membered silacyclic ring compounds LSi[N-2(Ph)(2)]-tBu (1), LSi[HCN(Ph)(2)]tBu (2) and LSi[C-2(Ph)(2)]tBu (3) were obtained by the treatment of base stabilized monoalkylsilylenes LSitBu (L = PhC(NtBu)(2)) with PhN=NPh, PhN=CHPh and PhC CPh. The reaction of PhN=NPh and PhC CPh with LSitBu shows a different reactivity pattern with base stabilized monochlorosilylene LSiCl. The arrangement of the three-membered ring (SiNN) in 1 is the first structurally isolated example of a siladiaziridine compound.