SIMULTANEOUS COORDINATION AND DOUBLE ACTIVATION PHENOMENA OF CARBONYLAND EPOXY OXYGENS BY BIS-TITANIUM REAGENT AS A BIDENTATE LEWIS-ACID CATALYST

Authors
ASAO N KII S HANAWA H MARUOKA K
Citation
N. Asao et al., SIMULTANEOUS COORDINATION AND DOUBLE ACTIVATION PHENOMENA OF CARBONYLAND EPOXY OXYGENS BY BIS-TITANIUM REAGENT AS A BIDENTATE LEWIS-ACID CATALYST, Tetrahedron letters, 39(22), 1998, pp. 3729-3732
Citations number
28
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Tetrahedron letters → ACNP
ISSN journal
00404039
Volume
39
Issue
22
Year of publication
1998
Pages
3729 - 3732
Database
ISI
SICI code
0040-4039(1998)39:22<3729:SCADAP>2.0.ZU;2-9
Abstract
The new bidentate Ti catalyst, (anthraquinone-1,8-dioxy)bis(triisoprop oxy- titanium) (1) can be successfully designed and utilized for the s imultaneous coordination to carbonyl substrates. The high double-activ ation ability of the bidentate Ti catalyst I toward carbonyls is empha sized using several synthetic examples in comparison with the correspo nding monodentate Ti catalyst. The intermediary coordination complex f ormation of bidentate 1 with DMF or epoxycyclohexane as a carbonyl or epoxy substrate is characterized by C-13 NMR spectroscopy. (C) 1998 El sevier Science Ltd. Ail rights reserved.