Neutral and Cationic Tridentate Bis(N-heterocyclic carbene) Ether Ruthenium Alkylidene Complexes in Metathesis
作者:Clinton L. Lund、Michael J. Sgro、Douglas W. Stephan
DOI:10.1021/om200848d
日期:2012.1.23
[O(CH2CH2ImMe)2][Br]2 (7) was prepared, transformed to (AgBr)2[O(CH2CH2ImMe)2] (8) and reacted with RuCl2(═CHPh)(PCy3)2 to give RuCl2(═CHPh)[O(CH2CH2ImMe)2] (9). Reaction of 9 with B(C6F5)3 generated the cationic species 10, which was shown to be the dimer [RuCl(═CHPh)(O(CH2CH2ImMe)2)]2[ClB(C6F5)3]2 in the solid state. Compound 9 was also ineffective as a metathesis catalyst; however, 10 proved to be a moderately
由甲氧基乙基咪唑与卤代乙基甲基咪唑鎓卤化物反应制备配体前体(MeOCH 2 CH 2 ImCH 2 CH 2 ImMe] X 2(X = Cl(2a),Br(2b)),随后转化为Ag 2 X 2(MeOCH 2通过用Ag 2 O处理获得CH 2 ImCH 2 CH 2 ImMe)(X = Cl(3a),Br(3b))。3a或3b与RuCl 2(PPh 3)反应3(4)得到RuCl 2(PPh 3)(MeOCH 2 CH 2 ImCH 2 CH 2 ImMe)(5)。以类似的方式用RuCl 2(= CHPh)(PCy 3)2处理3a或3b,得到亚烷基络合物RuCl 2(= CHPh)(MeOCH 2 CH 2 ImCH 2 CH 2 ImMe)(6)。在几种标准的复分解试验中,6被证明是不良的催化剂。相关的配体前体[O(CH 2制备CH 2 ImMe)2 ] [Br] 2(7),转化为(AgBr)2