Derivate des Imidazols, VI. Stabile Carben‐Borane

Abstract

Imidazole Derivatives, VI [1] . — Stable Carbene Boranes Stable imidazol‐2‐ylidene—borane adducts 8 and 9 are obtained from 1,3,4,5‐tetraalkylimidazol‐2‐ylidenes 7 and Me 2 S BH 3 or Et 2 O BF 3 . An X‐ray structure analysis of 8b has been performed. An ab initio calculation [MP2(fu)/6–31G ** ] reveals a low energy difference between two rotamers. The bond orders of the cyclic bonds imply only a minor interaction between the N—C—N and the C—C fragment.