高铼酸咪唑啉盐催化的邻二醇脱水脱氧生成烯烃

Imidazolinium Perrhenate-Catalyzed Deoxydehydration of Vicinal Diols to Alkenes

多元醇的脱氧脱水(DODH)生成烯烃的反应是生物质源平台分子催化转化制备化学品和液体燃料的重要方法之一,在有机合成上也有重要的价值.发展了一种新的邻二醇脱氧脱水反应的催化体系,以一种高铼酸咪唑啉盐为催化剂,考察了还原剂、溶剂等对反应的影响,并对不同长度碳链和不同取代基的底物进行了拓展,以中等到良好的产率得到相应的烯烃目标产物,反应催化剂用量少,并且可以进行回收和重复使用.

The deoxydehydration of polyols to alkenes is one of the important methods for the conversion of biomass-based platform molecules to useful chemicals and liquid fuels. A new imidazolinium perrhenate catalytic system for the deoxydehydration of vicinal diols to alkenes was reported. The reaction conditions, including reductants, solvents and imidazolinium cations were investigated. The best result was obtained with 3 equiv. of 3-octanol as the reductant in chlorobenzene at 180 ℃ under argon atmosphere, affording the 1-tetradecene product in 85% yield after 24 h. The catalyst shows moderate activity for several vicinal diols and can be reused after recoverd.