NHC-stabilized Al(III) and Ga(III) cationic alkyls: Synthesis, structure and use in hydrosilylation catalysis
作者:Anaëlle Bolley、David Specklin、Samuel Dagorne
DOI:10.1016/j.poly.2020.114956
日期:2021.1
tris-organyl Al(III) and Ga(III) cations, stand as potent Lewis acids as experimentally estimated through the Gutmann-Beckett method. These cations were further exploited in hydrosilylation catalysis of alkynes, benzaldehyde and CO2 using HSiEt3 as an hydrosilane source. Hydrosilylation of 1-hexyne, 4-phenylbutyne and phenylacetylene led to the formation of the corresponding Z-selective products 3-5, respectively
摘要由N-杂环卡宾(NHC)配体(IDipp)AlMe2(PhBr)] +([1] +,IDipp = 1,3-bis(2,6-制备了二异丙基苯基)咪唑啉-2-亚基和(IDipp)GaMe2] +([2] +),并通过相应中性前体(IDipp)MMe3(M = Al ,Ga)与[Ph3C] [B(C6F5)4]在室温下于PhBr中混合。高产率地分离了[1] [B(C6F5)4]和[2] [B(C6F5)4]盐,并通过X射线晶体学研究确定了它们的固态结构。阳离子[1] +和[2] +是结构特征化的三有机基Al(III)和Ga(III)阳离子的稀有实例,就像通过Gutmann-Beckett方法实验估计的强路易斯酸一样。这些阳离子被进一步用于炔烃的氢化硅烷化催化,使用HSiEt3作为氢化硅烷源的苯甲醛和CO2。1-己炔,4-苯基丁炔和苯乙炔的氢化硅烷化分别导致形成相应的Z-选择产物3-5,而苯