have been incorporated. The cationic complexes exhibit good activity in olefin metathesis at room temperature, provided no protic functional groups are present. Both neutral and cationic NHC (bis)pyrrolide complexes serve as excellent precursors to molybdenum imido alkylidene NHC complexes with sterically demanding alkoxides. Here, introduction of the alkoxide ligands proceeds upon protonation of pyrrole
通式Mo(NR 1)(CHCMe 2 Ph)(NC 4 H 4)2(NHC)和[Mo(NR 1)(CHCMe 2 Ph)(NC 4 H 4)(NHC)的中性和阳离子配合物[B(AR ˚F)4 ](R 1 = 2-吨卜-C 6 H ^ 4,2,6-我
镨2 -C 6 ħ 3,2,6-ME 2 -C 6 ħ 3,吨卜,广告; B(Ar F)4=四(3,5-(CF 3)2 -C 6 H 3)
硼酸盐; 已经合成了NHC =N-杂环卡宾。三个具有不同电子和空间特性的NHC
配体,分别是1,3-
二异丙基咪唑-2-亚烷基(IPr),1,3,5-三苯基-1,3,4-三唑-2-亚烷基(
TPT)和1 ,3-二甲基-
4,5-二氯咪唑-2-亚甲基(IMeCl)已合并。如果不存在质子官能团,则阳离子络合物在室温下在烯烃复分解中表现出良好的活性。中性和阳离子NHC(双)
吡咯化物配合物都是具有空间要求的醇盐的亚
氨基
钼亚烷基