α-异丙基对卤苯乙酸拆分方法的改进

α-甲基苄胺;α-异丙基对卤苯乙酸拆分方法的改进     

Brönsted酸性离子液体[Hmim]+BF4-中高选择性制备2,4-二苯基-4-甲基-1-戊烯的新方法

Highly selective dimerization of α-methylstyrene (AMS) was effected using a Broensted acidic ionic liquid,[Hmim]^ BF4^-, as solvent as well as catalyst, providing the industrial high-value olefin, 2,4-diphenyl-4-methyl-1-pentene (1-PT). The desired dimer 1-PT could be obtained in 90% yield at 96% conversion in the dimerization of AMS under optimized conditions. Features of the procedure include use of readily available ionic liquid-catalyst,exclusion of volatile organic solvents, higher selectivity and efficiency for 1-PT.