N -heterocyclic carbene and cyclic (alkyl)(amino)carbene adducts of plumbanes and plumbylenes.

Lewis -acid/base adducts of N -heterocyclic carbenes (NHCs) and the cyclic (alkyl)(amino)carbene cAAC Me (1-(2,6-di-iso-propylphenyl)-3,3,5,5-tetramethyl-pyrrolidin-2-ylidene) with selected lead(II) and lead(IV) compounds are presented. The reaction of the NHCs Me 2 Im Me (1,3,4,5-tetramethyl-imidazolin-2-ylidene), iPr 2 Im Me (1,3-di-isopropyl-4,5-dimethyl-imidazolin-2-ylidene), Dipp 2 Im (1,3-bis-(2,6-di-isopropylphenyl)-imidazolin-2-ylidene) and cAAC Me (1-(2,6-di-iso-propylphenyl)-3,3,5,5-tetramethyl-pyrrolidin-2-ylidene) with PbI 2 yielded the NHC-containing plumbylenes NHC·PbI 2 (NHC = Me 2 Im Me (1), iPr 2 Im Me (2), Dipp 2 Im (3) and cAAC Me ·PbI 2 (4)). Using the Pb(IV) compound PbCl 2 Ph 2 , the plumbane adducts NHC·PbCl 2 Ph 2 (NHC = Me 2 Im Me (5), iPr 2 Im Me (6), Dipp 2 Im (7)) and cAAC Me ·PbCl 2 Ph 2 (8)) were isolated in high yields. Reduction of the lead(IV) adducts 5 and 6 with excess KC 8 afforded the diaryl substituted plumbylenes Me 2 Im Me ·PbPh 2 (9) and iPr 2 Im Me ·PbPh 2 (10), which are stable in the solid state but decompose in solution.