A 3,4-dimercapto-3-cyclobutene-1,2-dione-chelated ruthenium carbene catalyst for <i>Z</i>-stereoretentive/stereoselective olefin metathesis
作者:Tao Wang、Qingxiao Xie、Weijie Guo、Shutao Wu、Huiqing Zhang、Jianhui Wang、Botao Wu
DOI:10.1039/c9dt01016e
日期:——
98 : 2). The catalyst also had high Z-stereoretentivity (91 : 9–98 : 2) for cross-metathesis (CM) reactions of terminal olefins with (Z)-2-butene-1,4-diol. More importantly, the catalyst had moderate Z-stereoselectivity for homometathesis reactions of terminal olefins giving cis-olefins as the major products (Z/E ratios of 70 : 30–77 : 23). Like other Ru carbene complexes, the catalyst tolerates many
合成了与3,4-二氧代环丁-1-烯-1,2-二硫代磺酸盐配体螯合的钌卡宾催化剂,并通过单晶X射线衍射确定了其分子结构。钌催化剂具有高的产率和良好的优异的催化活性ž / Ë比率开环易位聚合(ROMP)降冰片烯(产率:96%/ ž / é:86:14)和1,5-环辛二烯(产率: 86%/ Z / E:91:9)和降冰片烯/ 5-降冰片烯-2- exo,3 - exo-二甲醇与苯乙烯的开环交叉复分解(ROCM)反应(收率:64%–92%/ Z / E:97:3–98:2)或4-氟苯乙烯(收率:46%–94%/ Z / E:98:2)。对于末端烯烃与(Z)-2-丁烯-1,4-二醇的交叉复分解(CM)反应,该催化剂还具有较高的Z-立体定向性(91:9–98:2)。更重要的是,该催化剂具有适度的Z-立体选择性,可用于末端烯烃的均复分解反应,从而以顺式烯烃为主要产物(Z / E比例为70:30-77:2