First Neutral and Cationic Tungsten Imido Alkylidene <i>N</i>
-Heterocyclic Carbene Complexes
作者:Dominik A. Imbrich、Iris Elser、Wolfgang Frey、Michael R. Buchmeiser
DOI:10.1002/cctc.201700189
日期:2017.8.9
W(NAr′)(NHC)(=CHR)(OtBu)2 (7), [W(NAr′)(NHC)(=CHR)(OtBu)+][B(ArF)4−] (8), and W(NAr′)(NHC)(=CHR)(OCMe(CF3)2)2 (9) is described, and the reactivity of the complexes in olefin metathesis and cyclopolymerization is reported. The cationic complexes 4, 5, and 6 showed high productivity and activity in olefin metathesis reactions, with turnover numbers of up to 40 000 and turnover frequencies (TOF5min)
W(NAr')(NHC)(= CHR)(2,5-Me 2 pyr)2(1 ; Ar':2,6 - i Pr 2 C 6 H 3 ; NHC:1,3-二异丙基咪唑-2-亚基; 2,5-Me 2吡咯:2,5-二甲基吡咯; R:CMe 2 Ph),W(NAr')(NHC)(= CHR)(2,5-Me 2吡咯)(OC 6 F 5)(2),W(NAr')(NHC)(= CHR)(OSiPh 3)2(3),[W(NAr')(NHC)(= CHR)(OSiPh 3))(MeCN)+ ] [B(Ar F)4 −-(4; B(氩˚F)4 -:B(3,5-(CF 3)2 C ^ 6 ħ 3)4 - ),[W(NAR')(NHC)(= CHR)(2,5--ME 2 PYR) )+ ] [B(AR ˚F)4 - ](5),[W(NAR')(NHC)(= CHR)(OC 6 ˚F 5))(吨BuCN)+ ] [B(AR