The invention relates to ruthenium alkylidene complexes having an N-heterocyclic carbene ligand comprising a 5-membered heterocyclic ring having a carbenic carbon atom and at least one nitrogen atom contained within the 5-membered heterocyclic ring, wherein the nitrogen atom is directly attached to the carbenic carbon atom and is substituted by a phenyl ring, and wherein the phenyl ring has a hydrogen at either or both ortho positions and is substituted at at least one ortho or meta position. The invention also relates to an olefin metathesis reactions and particularly to the preparation of tetra-substituted cyclic olefins via a ring-closing metathesis.
本发明涉及具有N-杂环卡宾
配体的
钌烷基烯配合物,包括一个含有卡宾碳原子和至少一个氮原子的5元杂环环的杂环卡宾
配体,其中氮原子直接连接到卡宾碳原子,并被苯环取代,苯环在两个邻位或一个邻位和一个间位处有氢原子,并在至少一个邻位或间位被取代。本发明还涉及烯烃交换反应,特别是通过环闭合交换反应制备四取代环烯烃。