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烯烃复分解反应是形成碳碳双键的重要反应之一,其发展与结构明确的钌催化剂[L2X2Ru=CHR]中配体的创制密切相关.1999年,环二氨基卡宾配体的引入极大提高了催化剂的活性、稳定性以及官能团适用性.2005年,Bertrand等发展了一种比环二氨基卡宾具有更强给电子能力的配体──环(烷基)(氨基)卡宾(CAACs)配体,且卡宾中心α位为一季碳原子,这使得其空间环境与其他类型卡宾配体有很大差异.首先概述了CAACs配体的合成及性质,紧接着讨论了其在烯烃复分解催化反应中的研究进展,最后对该领域所存在的问题进行简要分析并对其发展作了展望.
The olefin metathesis reaction is one of the important reactions for the formation of carbon-carbon double bonds, and its development is closely related to the creation of ligands in well-defined ruthenium catalysts [L2X2Ru = CHR] .In 1999, the introduction of cyclic carbamidine ligands was greatly enhanced Catalyst activity, stability and functional group suitability In 2005, Bertrand et al. Developed a more electron-donating ligand, cyclo (alkyl) (amino) carbene (CAACs) And the α-position of the Carbine center is a quaternary carbon atom, which makes the space environment very different from other types of carbene ligands.Firstly, the synthesis and properties of CAACs ligands are summarized, followed by the discussion of their catalytic activity in olefin metathesis Finally, the problems existing in this field are briefly analyzed and the development of the research is prospected.