开发了一种基于Keggin型多金属氧酸盐的非腐蚀性,可循环利用的高效多相催化剂,即[NMPH] H 3 [SiW 12 O 40 ],用于醇与醇(或烯烃)的直接脱水偶联,以合成各种多取代的烯烃产量高到极好。此外,该反应可以扩大规模,并且该催化剂可以使用七次而不会显着降低活性。动力学竞争实验表明,C–H键的断裂可能参与了速率确定步骤。
Simple and efficient cross coupling of alcohols was developed in the presence of NaHSO4/SiO2 to give the corresponding substituted olefins. Direct coupling of alcohols and alkenes was also achieved to give substituted olefins. NaHSO4/SiO2 could be recycled 7 times without loss of catalytic activity.
An efficient dehydrogenative Diels–Alderreaction of prenyl derivatives with dienophiles has been developed. The reaction exhibits broad substrate scope and provides efficient access to cyclohexene derivatives with good to excellent yields. A reasonable mechanism involving a metal-free thermal reversible process is proposed.
Non-corrosive heteropolyacid-based recyclable ionic liquid catalyzed direct dehydrative coupling of alcohols with alcohols or alkenes
作者:Guo-Ping Yang、Nan Jiang、Xian-Qiang Huang、Bing Yu、Chang-Wen Hu
DOI:10.1016/j.mcat.2019.02.019
日期:2019.5
A non-corrosive, recyclable and efficient heterogeneous catalyst based on Keggin-type polyoxometalate, i.e., [NMPH]H3[SiW12O40] was developed for the direct dehydrative coupling of alcohols with alcohols (or alkenes) to synthesize various polysubstituted olefins in good to excellent yields. Furthermore, this reaction could be scaled up and the catalyst could be used for seven runs without significant
开发了一种基于Keggin型多金属氧酸盐的非腐蚀性,可循环利用的高效多相催化剂,即[NMPH] H 3 [SiW 12 O 40 ],用于醇与醇(或烯烃)的直接脱水偶联,以合成各种多取代的烯烃产量高到极好。此外,该反应可以扩大规模,并且该催化剂可以使用七次而不会显着降低活性。动力学竞争实验表明,C–H键的断裂可能参与了速率确定步骤。