室温离子液体中水溶性铑膦配合物催化1-己烯氢甲酰化反应的研究

Hydroformylation of 1-Hexene with Water-soluble Phosphine- rhodium Complexes in Room Temperature Ionic Liquids

研究了水溶性膦配体铑配合物在若干离子液体中的1 己烯氢甲酰化反应性能.通过改变离子液体的阴阳离子结构,可使水溶性TPPTS 铑配合物在离子液体中表现出较高的1 己烯氢甲酰化反应活性和选择性;在[BMI]BF4离子液体中加入适量的水,可提高TPPTS 铑配合物的催化活性;在[BMI]BF4离子液体中,水/有机两亲性膦配体与铑形成的配合物,反应后催化剂与产物自动分层,实现催化剂的循环使用.本文结果表明,水溶性膦配体铑配合物的催化活性与其在离子液体中的溶解度密切相关.

This paper studied the catalytic performances of water-soluble phosphine-rhodium complexes in room temperature ionic liquids for 1-hexene hydroformylation. The higher reaction rate and normal aldehyde selectivity were obtained through choosing the proper anionic and cationic groups of the ionic liquids. Moreover, the catalytic activity of TPPTS-rhodium complex could be increased by increasing the solubility of TPPTS in the ionic liquids like [BMI]BF_4 and also by the addition of small amount of water into the [BMI]BF_4 ionic liquid. The recycling of the catalysts based amphiphilic phosphines was achieved in the [BMI]BF_4 ionic liquid without significant loss in the catalytic activity due to the easy phase separation. The experimental results inferred that the solubility of water-soluble rhodium complexes was key to obtain the reasonable catalytic activity.