Carbene complexes. Part III. Carbon-13 nuclear magnetic resonance studies of carbene complexes of 1,3-diorganoimidazolidin-2-ylidenes

Abstract

¹³ C N.m.r. data for the series of cis and trans-neutral carbene complexes [MX₂(R₃′E)([graphic omitted]R)](where M = Pt, Pd; E = P, As; X = Cl, Br, Me; R = Me, Ph; and R′= Et, Prⁿ, Buⁿ), and the related complexes Fe(CO)₄ [graphic omitted](CH₃) and cis-Cr(CO)₄[C(SCH₃)₂]₂ are presented. The chemical shift of the carbene carbon is sensitive to the trans-ligand. Unusual long range ³¹P–¹³C couplings to the ring methylene carbon and ¹⁹⁵Pt–¹³C_carb couplings are reported for four of the complexes studied.