Synthesis and molecular structure of an abnormal carbene–gallium chloride complex†
Abstract
Low temperature reaction of N-heterocyclic carbene : BEt3 with nBuLi (in THF) initially gives the C4-lithiated N-heterocyclic carbene : BEt3 complex (4), which isomerizes to the C2-lithiated abnormal N-heterocyclic carbene : BEt3 complex (2) in refluxing THF. While reaction of 2 with GaCl3 gives a 4-functionalized N-heterocyclic carbene : GaCl3 adduct (6), reaction of 4 with GaCl3 affords the first abnormal carbene–gallium chloride complexes (5).
- This article is part of the themed collection: New Expeditions in Polar Organometallic Chemistry