Synthesis and molecular structure of an abnormal carbene–gallium chloride complex

摘要

Low temperature reaction of N-heterocyclic carbene: BEt3 with nBuLi (in THF) initially gives the C4-lithiated N-heterocyclic carbene: BEt_3 complex (4), which isomerizes to the C2-lithiated abnormal N-heterocyclic carbene: BEt_3 complex (2) in refluxing THF. While reaction of 2 with GaCl_3 gives a 4-functionalized N-heterocyclic carbene: GaCl_3 adduct (6), reaction of 4 with GaCl_3 affords the first abnormal carbene–gallium chloride complexes (5).