- Process for producing substituted metallocene compounds for olefin polymerization
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A process for producing a substituted metallocene compound comprises reacting a first compound with a transfer-agent, wherein the first compound comprises a complex of a transition metal atom selected from Group 3, 4, 5 or 6 of the Periodic Table of Eleme
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Page/Page column 134
(2015/11/10)
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- Palladium-catalyzed cross-coupling reactions of bromo-substituted group 4 metallocenes
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Pd-catalyzed Negishi reactions of Zr and Hf complexes bearing η5 -4-bromo-2-methylindenyl and η5 -2-bromoindenyl ligands with MeZnCl and various aryl- and heteroarylzinc reagents (RZnCl) give in high yields the respective complexes b
- Ryabov, Alexey N.,Izmer, Vyatcheslav V.,Tzarev, Alexey A.,Uborsky, Dmitry V.,Asachenko, Andrey F.,Nikulin, Mikhail V.,Canich, Jo Ann M.,Voskoboynikov, Alexander Z.
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p. 3614 - 3617
(2009/12/08)
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- Steric and electronic effects of R in (2-(4-R-C6H4)indenyl)2ZrCl2catalysts on the synthesis of elastomeric polypropylene
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Metallocene catalysts derived from bis(2-arylindenyl)zirconium dichloride catalysts yield elastomeric stereoblock polypropylene. A study of the steric and electronic effects of varying the 4-substituent of bis(2-(4-R-C6 H4)indenyl)zirconium dichloride [(1 R=H, 2 R=Me, 3 R=Et, 4 R=nBu, 5 R=tBu, 6 R=SiMe3, 7 R=CF3, 8 R=Cl)] on propylene polymerization at 25, 50, 75 psig and bulk propylene revealed that the polymerization behavior of these catalysts is not strongly influenced by the nature of the substituent in the 4-position of the 2-aryl substituent. Examinations of the microstructure of the elastomeric polypropylenes produced showed that for catalysts 2-8 the isotacticities varied over a small range and were similar to those produced by catalyst 1 (20% ≤ [mmmm] ≤ 44%). The catalyst productivities and molecular weights also showed the same trend. Complex 3 was crystallographically characterized and was found to crystallize in exclusively the meso conformation.
- Lin, Shirley,Hauptman, Elisabeth,Lal, Tapan K.,Waymouth, Robert M.,Quan, Roger W.,Ernst, Andreas B.
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