B(C6F5)3 in the presence of an external Lewis base (THF, Et2O) to afford the corresponding cations of the type (NHC)MMe2(L)+ (L labile) as CH3B(C6F5)3- salts. Such cations, which are the first examples of NHC-stabilized Al and Ga cationic alkyls, are stable in solution (CH2Cl2) and the molecular structure of cation (IMes)AlMe2(Et2O)+ was determined by X-ray crystallographic diffraction studies. All cationic
由N-杂环卡宾(NHC),(NHC)MMe 3(NHC = IMes = 1,3-双(2,4,6-三甲基苯基)
咪唑-2-亚基,IDipp )负载的13族
金属(Al,Ga)烷基在外部路易斯碱(THF,Et 2)存在下,通过B(C 6 F 5)3的甲基化物提取途径成功地将1,3,1-二-
二异丙基苯基
咪唑-2-亚甲基; M = Al,Ga)电离。 O),得到式(NHC)MME的相应阳离子2(L)+(L不稳定),为CH 3 B(C 6 ˚F 5)3 -盐。这类阳离子是NHC稳定的Al和Ga阳离子烷基的第一个例子,在溶液(CH 2 Cl 2)中稳定,并且阳离子(IMes)AlMe 2(Et 2 O)+的分子结构由X-射线晶体衍射研究。还测试了所有阳离子化合物作为rac-
丙交酯(rac -
LA)的开环聚合(ROP)的
引发剂。Al阳离子(IMes)AlMe 2(THF)+在室温下在BnOH存在下有效聚合rac