Latent Thermo-Switchable Olefin Metathesis Initiators Bearing a Pyridyl-Functionalized Chelating Carbene: Influence of the Leaving Group’s Rigidity on the Catalyst’s Performance
作者:Anna Szadkowska、Xaver Gstrein、Daniel Burtscher、Katarzyna Jarzembska、Krzysztof Woźniak、Christian Slugovc、Karol Grela
DOI:10.1021/om900857w
日期:2010.1.11
The synthesis and characterization of two ruthenium complexes bearing chelating carbene ligands is described. Carbene precursors, 2-(2-vinylphenyl)pyridine and 10-vinylbenzo[h]quinoline, are applied to prepare (SPY-5-31)-dichloro-(κ2(C,N)-N-2-(2-vinylbenzylidene)pyridine(1,3-bis(2,4,6-trimethylphenyl)4,5-dihydroimidazol-2-ylidene)ruthenium (VIII) and (SPY-5-31)-dichloro-(κ2(C,N)-2-(benzo[h]quinoli
描述了带有螯合卡宾配体的两种钌配合物的合成和表征。卡宾前体,2-(2-乙烯基苯基)吡啶和10乙烯基苯并[ ħ ]喹啉,被施加到制备(SPY-5-31) -二氯- (κ 2(C,N)-N-2-(2- vinylbenzylidene)吡啶(1,3-双(2,4,6-三甲基苯基)-4,5-二氢咪唑-2-亚基)钌(VIII)和(SPY-5-31) -二氯- (κ 2(C,N )-2-(苯并[ h ]喹啉-10-基)亚甲基)(1,3-双(2,4,6-三甲基苯基)4,5-二氢咪唑-2-亚烷基)钌(IX)。两种催化剂/引发剂均用于进行开环复分解(RCM)和开环复分解聚合(ROMP)。RCM实验表明,在强迫反应条件下(如甲苯沸腾48小时),催化剂具有显着的热稳定性。甚至具有挑战性的底物,例如二乙基烯丙基(2-甲基烯丙基)丙二酸酯也可以在低催化剂负载下(在110°C时为0.1 mol%)完全转化。高的热稳定