PRESSURE MODULATES STEREOREGULARITIES IN THE POLYMERIZATION OF PROPYLENE PROMOTED BY RAC-OCTAHEDRAL HETEROALLYLIC COMPLEXES

Authors
VOLKIS V SHMULINSON M AVERBUJ C LISOVSKII A EDELMANN FT EISEN MS
Citation
V. Volkis et al., PRESSURE MODULATES STEREOREGULARITIES IN THE POLYMERIZATION OF PROPYLENE PROMOTED BY RAC-OCTAHEDRAL HETEROALLYLIC COMPLEXES, Organometallics, 17(15), 1998, pp. 3155-3157
Citations number
46
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
Organometallics → ACNP
ISSN journal
02767333
Volume
17
Issue
15
Year of publication
1998
Pages
3155 - 3157
Database
ISI
SICI code
0276-7333(1998)17:15<3155:PMSITP>2.0.ZU;2-9
Abstract
This communication reports the synthesis and activity of four racemic mixtures of bis(benzamidinate) group-4 complexes, cis-[p-R'C6H4C(NR)(2 )](2)MX2 (R' = CH3, R = SiMe3, M = Ti, X = Cl (I); R' = CH3, R = SiMe3 , M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH3, R = SiMe3, M = Zr, X = CH3 (4)) as precatalysts for the stereoregular polymerization of propylene. These complexes catalyze the stereoregula r polymerization. of propylene only under pressure in CH2Cl2, producin g polypropylene with very Large isotacticities (mmmm % = similar to 95 -98), high melting points (140-154 degrees C).