Enantioselective alternating copolymerizaion from carbon monoxide and styrene was carried out using cationic palladium catalyst modified by 1, 4-3, 6-dianhydro-2, 5-O-bis（benzo[1,3,2]dioxaphospholyl-2）-D-mannitol.Th...Enantioselective alternating copolymerizaion from carbon monoxide and styrene was carried out using cationic palladium catalyst modified by 1, 4-3, 6-dianhydro-2, 5-O-bis（benzo[1,3,2]dioxaphospholyl-2）-D-mannitol.The chiral diphosphine was proved to be effective in the enantioselective copolymerization. The pure poly（1,4-ketone）were obtained and characterized by GPC,（）1H-NMR,（）13C-NMR,IR and elemental analyzer.展开更多
trimethyl hexanoic methylester was sythesised by hydroesterfication of branched olefin diisobutylene under mild conditions.With th changes of conditions we achieved rather good yield 78% (yield of 3,5,5 trimethyl hexa...trimethyl hexanoic methylester was sythesised by hydroesterfication of branched olefin diisobutylene under mild conditions.With th changes of conditions we achieved rather good yield 78% (yield of 3,5,5 trimethyl hexanoic methylester) conversation of olefin 85% and good selectivity 93%,the optimum conditions are:reaction time 16h,pressure 8.0MPa,temperature 130℃.展开更多
Two new chiral phosphine ligands,1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinoxy)-L-iditol and 1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinsulphur)-L-iditol were prepared from D-mannitol.Pall...Two new chiral phosphine ligands,1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinoxy)-L-iditol and 1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinsulphur)-L-iditol were prepared from D-mannitol.Palladium catalytic systems formed with these ligands in situ were used as asymmetric homogenous catalysts for hydroesterification of styrene,giving(R)-2-phenyl propionate in 16.9 and 9.2% ee values,respectively.展开更多
文摘Enantioselective alternating copolymerizaion from carbon monoxide and styrene was carried out using cationic palladium catalyst modified by 1, 4-3, 6-dianhydro-2, 5-O-bis（benzo[1,3,2]dioxaphospholyl-2）-D-mannitol.The chiral diphosphine was proved to be effective in the enantioselective copolymerization. The pure poly（1,4-ketone）were obtained and characterized by GPC,（）1H-NMR,（）13C-NMR,IR and elemental analyzer.
文摘trimethyl hexanoic methylester was sythesised by hydroesterfication of branched olefin diisobutylene under mild conditions.With th changes of conditions we achieved rather good yield 78% (yield of 3,5,5 trimethyl hexanoic methylester) conversation of olefin 85% and good selectivity 93%,the optimum conditions are:reaction time 16h,pressure 8.0MPa,temperature 130℃.
文摘Two new chiral phosphine ligands,1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinoxy)-L-iditol and 1,4∶3,6-dianhydro-2,5-O-dideoxy-2,5-bis(dipheny-phosphinsulphur)-L-iditol were prepared from D-mannitol.Palladium catalytic systems formed with these ligands in situ were used as asymmetric homogenous catalysts for hydroesterification of styrene,giving(R)-2-phenyl propionate in 16.9 and 9.2% ee values,respectively.
基金The National Basic Research Program of China(973 Program,No.2007CB613305,2009CB22003,and 2009AA05Z117)NSFC21173242+1 种基金the 863 program(No.2009AA05Z117)Chinese Academy of Sciences Knowledge Innovation Program(KGCX2-YW-390-1)
