A new mono-substituted titanocene,(η~5-cyclopentadienyl)[η~5-(1-(4-methoxyphenyl)cyclohexyl) cyclopentadienyl]dichlorotitanium(I),has been prepared via a novel modified synthesis,and its X-ray crystal structure has ...A new mono-substituted titanocene,(η~5-cyclopentadienyl)[η~5-(1-(4-methoxyphenyl)cyclohexyl) cyclopentadienyl]dichlorotitanium(I),has been prepared via a novel modified synthesis,and its X-ray crystal structure has been determined.It crystallizes in the orthorhombic space group P2_12_12_1 with cell constants a=0.9680(5)nm,b=1.2846(5)nm,c=1.6944(6)nm,Z=4,R=0.066.The I/methylaluminoxane(MAO)catalyst system produces at different polymerization temperatures either an isotactic or a syndiotactic polypropylene, both of which have the combined influence of enantiomorphic-site control and chain-end control,or an atactic polypropylene controlled by Bernoallian propagation mechanism.展开更多
基金the National Natural Science Foundation of China.
文摘A new mono-substituted titanocene,(η~5-cyclopentadienyl)[η~5-(1-(4-methoxyphenyl)cyclohexyl) cyclopentadienyl]dichlorotitanium(I),has been prepared via a novel modified synthesis,and its X-ray crystal structure has been determined.It crystallizes in the orthorhombic space group P2_12_12_1 with cell constants a=0.9680(5)nm,b=1.2846(5)nm,c=1.6944(6)nm,Z=4,R=0.066.The I/methylaluminoxane(MAO)catalyst system produces at different polymerization temperatures either an isotactic or a syndiotactic polypropylene, both of which have the combined influence of enantiomorphic-site control and chain-end control,or an atactic polypropylene controlled by Bernoallian propagation mechanism.
