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