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金屬-Salen錯合物在催化反應上的應用

Metallo-Salen Complexes in Catalysis

摘要


以二胺化合物和salicyaldehyde 經簡單的縮合反應可形成含四配位具螫合能力的Salen 結構,此結構可分別和Ti、Al、Mn、Cr、Co、Fe、Ni、Cu 和Zn 等金屬的前軀物進行配位反應形成金屬-Salen 錯合物,以此錯合物為觸媒分別可催化Claisen 重組、Friedel-Crafts 反應、Diels-Alder 反應、Michael addition 反應、環氧化反應以及環氧化物的開環及聚合等多種反應。金屬-Salen 錯合物另一優點為容易調整Salen 上的官能基以及使結構中含有光學活性,官能基的調整可以提升觸媒活性、結構中含手性則可以使催化反應產生的生成物也含手性,廣泛以及突出的應用能力已經使金屬-Salen 錯合物觸媒吸引眾多研究人員矚目。

並列摘要


The Salen ligands can be easily prepared by the condensation between two equivalents of salicylaldehyde and diamines. Salen ligands possess four coordinating sites and two axial sites open to ancillary ligands. Stereogenic centers or other elements of chirality can be easily introduced in the synthetic design. Salen ligands are able to coordinate many different metals. The ability of stabilizing metals in various oxidation states and the unique nature of their cooperative multimetallic catalysis make metallo-Salen complexes superior catalysts for a variety of organic transformations including Claisen rearrangement, Friedel-Crafts reaction, Diels-Alders reaction, Michael addition, epoxidation, epoxide ring-opening reaction, and cyclopropanation.

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