Thermally stable potassium N-heterocyclic carbene complexes with alkoxide ligands,and a polymeric crystal structure with distorted,bridging carbenes

摘要

Alkoxide-functionalised N-heterocyclic carbenes (NHCs) stabilise the potassium-imidazole-2-ylidene fragment against 1,2 alkyl rearrangement reactions;this allows the first structural characterisation of a potassium NHC complex,which reveals distorted and unusual bonding interactions between the imidazole ring and the potassium cation.