Constructing a Stable Carbene with a Novel Topology and Electronic Framework

The perimidine skeleton provides a framework for the isolation of a novel, stable carbene possessing a unique molecular architecture and electronic structure. The remarkable steric environment and exceptional electron-donating ability for the carbene-carbon are revealed through structural and spectroscopic characterization of the parent carbene and two sterically encumbered rhodium-carbene complexes, L<sub>2</sub>RhCl{C[NCH(CH<sub>3</sub>)<sub>2</sub>]<sub>2</sub>(C<sub>10</sub>H<sub>6</sub>)} (<b>5</b> L<sub>2</sub> = COD; <b>6 </b>L = CO).