Bis-zirconium and bis-hafnium catalysts for the strong activation of carbonyl substrates

Authors
Hanawa, H Kii, S Asao, N Maruoka, K
Citation
H. Hanawa et al., Bis-zirconium and bis-hafnium catalysts for the strong activation of carbonyl substrates, TETRAHEDR L, 41(29), 2000, pp. 5543-5546
Citations number
45
Categorie Soggetti
Chemistry & Analysis","Organic Chemistry/Polymer Science
Journal title
TETRAHEDRON LETTERS
ISSN journal
00404039 → ACNP
Volume
41
Issue
29
Year of publication
2000
Pages
5543 - 5546
Database
ISI
SICI code
0040-4039(20000715)41:29<5543:BABCFT>2.0.ZU;2-J
Abstract
(3,3'-Di-t-butyl-5,5'-dimethylbenzophenone-2,2'-dioxy)bis(triisopropoxyzirc onium) and its hafnium derivative can be successfully utilized in organic s ynthesis as bimetallic Lewis acid catalysts. The high activation ability of such catalysts toward carbonyls is emphasized using several synthetic exam ples including the asymmetric allylation in comparison with the correspondi ng mono-Zr as well as bis-Ti catalysts. (C) 2000 Elsevier Science Ltd. All rights reserved.