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Activation of Metallacyclopropenes, five‐membered Metallacyclocumulenes and Metallacyclopentynes of Zirconium with i Bu 2 AlH
Author(s) -
Burlakov Vladimir V.,
Bach Marc A.,
Klahn Marcus,
Arndt Perdita,
Baumann Wolfgang,
Spannenberg Anke,
Rosenthal Uwe
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690066
Subject(s) - zirconium , polymerization , ring opening polymerization , chemistry , catalysis , ethylene , metallocene , crystallography , polymer chemistry , medicinal chemistry , stereochemistry , nuclear chemistry , inorganic chemistry , polymer , organic chemistry
Abstract The recently described reaction products of zirconacyclopropenes Cp ′ 2 Zr(η 2 ‐Me 3 SiC 2 SiMe 3 ) and five‐membered zirconacyclocumulenes (zirconacyclopenta‐2,3,4‐trienes) Cp* 2 Zr(η 4 ‐1,2,3,4‐RC 4 R), Cp* = η 5 ‐pentamethylcyclopentadienyl, R = Me, Me 3 Si and Ph, with i ‐Bu 2 AlH are active catalysts in the polymerization of ethylene and in the ring opening polymerization of ε‐caprolactone. Here we describe the different activity of these complexes after thermal activation or if additional i ‐Bu 2 AlH together with water are added. These results are compared to those which were obtained with the complexes Cp 2 Zr(η 4 ‐1,2,3,4‐H 2 C 4 H 2 ), rac ‐(EBTHI)ZrF 2 , rac ‐(EBTHI)ZrCl 2 , [ rac ‐(EBTHI)Zr(H)(µ‐H)] 2 and rac (EBTHI)Zr(F)CH 2 ‐CH 2 (2‐Py) after activation with i ‐Bu 2 AlH together with water.