Boron- and silicon-bridged bis(diphenylphosphino)-type ligands for chromium-catalyzed ethylene oligomerization  

作　　者：Yueming Sun Yanhui Chen Guoliang Mao Yingnan Ning Tao Jiang 

机构地区：[1]College of Material Science and Chemical Engineering,Tianjin University of Science & Technology [2]College of Chemistry and Chemical Engineering,Northeast Petroleum University

出　　处：《Chinese Science Bulletin》2014年第21期2613-2617,共5页

基　　金：supported by the National Natural Science Foundation of China (U1162114,U1362110);the Program for New Century Excellent Talents in University (NCET-070142)

摘　　要：PNP-type ligands showed very good property in the catalytic systems of PNP/Cr(Ⅲ)/methylaluminoxane(MAO)for ethylene selective tetramerization toward1-octene.In this research,two PNP analogues bis(diphenylphosphino)phenylborane and bis(diphenylphosphino)dimethylsilane have been synthesized and characterized.In combination with CrCl3(THF)3as active center and MAO as cocatalyst,these ligands produced a new catalytic systems for ethylene oligomerization to linear α-olefins with catalytic activities of up to 3.07 9 106g mol-1(cat)h-1.Herein,we report the effects of the reaction temperature,ethylene pressure,and the molar ratio of Al/Cr on the catalyst activities and product selectivities.PNP-type ligands showed very good property in the catalytic systems of PNP/Cr（III）/methylaluminoxane （MAO） for ethylene selective tetramerization toward 1-octene. In this research, two PNP analogues bis（diphenyl- phosphino）phenylborane and bis（diphenylphosphino）dimeth-ylsilane have been synthesized and characterized. In combination with CrC13（THF）3 as active center and MAO as cocatalyst, these ligands produced a new catalytic systems for ethylene oligomerization to linear α-olefins with catalytic activities of up to 3.07× 10^6 g mol^-1 （cat） h^-1. Herein, we report the effects of the reaction temperature, ethylene pressure, and the molar ratio of Al/Cr on the catalyst activities and product selectivities.

关 键 词：二苯基膦 催化体系 乙烯 低聚 配体 硅桥连 PNP型 铬 

分 类 号：O621.251[理学—有机化学]