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)ph...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.展开更多
Researches of late-transition metal complexes for ethylene polymerization and oligomerization have attracted a lot of attention in the last two decades.A large number of late-transition metal complexes with symmetric ...Researches of late-transition metal complexes for ethylene polymerization and oligomerization have attracted a lot of attention in the last two decades.A large number of late-transition metal complexes with symmetric diimine ligands have been extensively studied.Although the research of unsymmetric diimine late-transition metal complexes was still in the initial stage,some superior performances were observed in olefin polymerization.Recent developments in the research of ethylene polymerization and oligomerization catalyzed by late-transition metal complexes with unsymmetric diimine ligands were summarized in this review,with the influence of complex structure on the catalytic performance of the catalyst analyzed.展开更多
基金supported by the National Natural Science Foundation of China (U1162114,U1362110)the Program for New Century Excellent Talents in University (NCET-070142)
文摘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.
基金supported by the National Natural Science Foundation of China (20972025,U1362110)the China National Petroleum Corporation (CNPC) Innovation Foundation (2013D-5006-0503)+1 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Heilongjiang Province (41417837-8-08016)the Scientific Research Foundation for Overseas Chinese Scholars,Department of Education of Heilongjiang Province (1154H14)
文摘Researches of late-transition metal complexes for ethylene polymerization and oligomerization have attracted a lot of attention in the last two decades.A large number of late-transition metal complexes with symmetric diimine ligands have been extensively studied.Although the research of unsymmetric diimine late-transition metal complexes was still in the initial stage,some superior performances were observed in olefin polymerization.Recent developments in the research of ethylene polymerization and oligomerization catalyzed by late-transition metal complexes with unsymmetric diimine ligands were summarized in this review,with the influence of complex structure on the catalytic performance of the catalyst analyzed.
