• Rac-[CH2(2,4-di-tert-butyl-cyclopentadienyl)2]-ZrCl2 (1), rac-[CH2(3-tert-butyl-4,5,6,7-tetrahydroindenyl)2]-ZrCl2 (2), rac-[CH2(3-isopropyl-4,5,6,7-tetrahydroindenyl)2]-ZrCl2 (3), and rac-[CH2(3-methyl-4,5,6,7-tetrahydroindenyl)2]ZrCl2 (4) were synthesized and characterized by 1H NMR anal. These C2 sym. ansa-zirconocenes, activated with methylaluminoxane (MAO), were able to promote copolymn. of ethene and 1,3-butadiene. The structures of the copolymers are strongly influenced by zirconocene utilized as catalytic precursor. Depending on the reaction conditions polyethenes contg. cyclopropane and cyclopentane rings, or 1,1- 1,3-butadiene inserted constitutional units, were obtained.
New group IV metallocene systems active in the copolymerization of α-olefins and conjugated dienes
PRAGLIOLA, Stefania;COSTABILE, Chiara;LONGO, Pasquale
2006-01-01
Abstract
• Rac-[CH2(2,4-di-tert-butyl-cyclopentadienyl)2]-ZrCl2 (1), rac-[CH2(3-tert-butyl-4,5,6,7-tetrahydroindenyl)2]-ZrCl2 (2), rac-[CH2(3-isopropyl-4,5,6,7-tetrahydroindenyl)2]-ZrCl2 (3), and rac-[CH2(3-methyl-4,5,6,7-tetrahydroindenyl)2]ZrCl2 (4) were synthesized and characterized by 1H NMR anal. These C2 sym. ansa-zirconocenes, activated with methylaluminoxane (MAO), were able to promote copolymn. of ethene and 1,3-butadiene. The structures of the copolymers are strongly influenced by zirconocene utilized as catalytic precursor. Depending on the reaction conditions polyethenes contg. cyclopropane and cyclopentane rings, or 1,1- 1,3-butadiene inserted constitutional units, were obtained.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
