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首页> 外文期刊>Tetrahedron >Novel imidazolium ion-tagged Ru-carbene complexes: synthesis and applications for olefin metathesis in ionic liquid
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Novel imidazolium ion-tagged Ru-carbene complexes: synthesis and applications for olefin metathesis in ionic liquid

机译:新型咪唑鎓离子标记的Ru-卡宾配合物:离子液体中烯烃复分解的合成及应用

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摘要

Novel Hoveyda-type Ru-carbene complexes 7a,b and 8a,b tethering imidazolium tags at chelating isopropoxy group have been synthesized, and investigated their catalytic activities and recyclabilities in ring-closing metathesis (RCM) and cross metathesis (CM) in ionic liquids. They showed excellent catalytic activities for RCM of various dienes in [bmim][PF6]/CH2Cl2 (1/1, v/v). The recyclability of these catalysts is largely dependent on the tether length and the structures of imidazolium tag and ionic liquid, as well as the composition of the ionic solvent system. A combination of the 2-methylated imidazolium ion-tagged Ru-complex 7b with a mixture of [bdmim][PF6]/toluene (1/3, v/v) allowed several times recycling without significant loss of catalytic activity in RCM, however low recyclabilities were observed in CMs.
机译:合成了在螯合异丙氧基上束缚咪唑鎓标记的新型Hoveyda型Ru-卡宾络合物7a,b和8a,b,并研究了它们在离子液体中的闭环复分解(RCM)和交叉复分解(CM)中的催化活性和可回收性。 。它们在[bmim] [PF6] / CH2Cl2(1/1,v / v)中显示出对各种二烯RCM优异的催化活性。这些催化剂的可回收性在很大程度上取决于系链的长度,咪唑鎓标签和离子液体的结构以及离子溶剂系统的组成。将2-甲基化的咪唑鎓离子标记的Ru络合物7b与[bdmim] [PF6] /甲苯(1/3,v / v)的混合物结合使用,可以多次循环使用,而不会显着降低RCM中的催化活性在CM中观察到低的可回收性。

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