Selective ring-opening cross-metathesis of cycloolefins
    6.
    发明授权
    Selective ring-opening cross-metathesis of cycloolefins 有权
    环烯烃的选择性开环交叉复分解

    公开(公告)号:US06803429B2

    公开(公告)日:2004-10-12

    申请号:US10114674

    申请日:2002-04-01

    IPC分类号: C08F444

    摘要: A catalytic method is provided for a ring-opening cross-metathesis reaction between a cycloolefinic substrate and a second olefinic reactant, wherein the catalyst used is a transition metal alkylidene complex substituted with an N-heterocyclic carbene ligand. The substrates are selected so that the rate of the cross-metathesis reaction of the second olefinic reactant, kCM, is greater than or equal to the rate of the ring-opening metathesis reaction, kRO. In this way, the predominant ROCM product is a monomer, dimer, and/or oligomer, but not a polymer. The invention additionally provides for selective production of an end-differentiated olefinic product, using trisubstituted cycloolefins as substrates and/or a subsequent cross-metathesis reaction following an initial ROCM step. The cycloolefinic substrates include low-strain olefins such as cyclohexene as well as higher strain olefins such as cyclooctene.

    摘要翻译: 提供了用于环烯基底物和第二烯属反应物之间的开环交叉复分解反应的催化方法,其中使用的催化剂是被N-杂环卡宾配体取代的过渡金属亚烷基络合物。 选择底物使得第二烯属反应物的交叉复分解反应速率kCM大于或等于开环复分解反应速率(kRO)。 以这种方式,主要的ROCM产物是单体,二聚体和/或低聚物,但不是聚合物。 本发明另外提供了在初始ROCM步骤之后使用三取代的环烯烃作为底物和/或随后的交叉复分解反应来选择性生产末端分解的烯烃产物。 环烯烃底物包括低应变烯烃如环己烯以及较高级烯烃如环辛烯。