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Bimetallic Titanocene or Zirconocene/Aluminium Complexes as Active Catalysts in Lactone Polymerization Reactions
Author(s) -
Arndt Perdita,
Spannenberg Anke,
Baumann Wolfgang,
Becke Sigurd,
Rosenthal Uwe
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200111)2001:11<2885::aid-ejic2885>3.0.co;2-9
Subject(s) - chemistry , bimetallic strip , metallocene , alkyne , hydride , nuclear magnetic resonance spectroscopy , polymer chemistry , catalysis , medicinal chemistry , polymerization , stereochemistry , organic chemistry , metal , polymer
The metallocene alkyne complexes [Cp 2 M(L)(η 2 ‐Me 3 SiC 2 R)] react with diisobutylaluminium hydride at room temp. by addition of HAl( i Bu) 2 to yield the heterobimetallic complexes [{Cp 2 M}(μ‐η 1 :η 2 ‐RCCSiMe 3 )(μ‐H){Al( i Bu) 2 }] [{Cp 2 M}: (η 5 ‐C 5 H 5 ) 2 Ti, R = Ph 1 , R = SiMe 3 2 ; {Cp 2 M}: (η 5 ‐C 5 H 5 ) 2 Zr, R = SiMe 3 3 ; {Cp 2 M}: (ebthi)Zr, R = SiMe 3 4 ] {ebthi: rac ‐[1,2‐ethylene‐1,1′‐bis(η 5 ‐tetrahydroindenyl)]}. Complexes 1−4 were characterized by NMR spectroscopy and 1 , 2 and 4 investigated by X‐ray crystal structure analysis. Compounds 1−4 were tested as initiators in the ring‐opening polymerization of lactones. The results are discussed in comparison to the corresponding monometallic titanocene and zirconocene alkyne complexes.