CHARACTERIZATION OF CHIRAL YTTERBIUM AND SCANDIUM CATALYSTS BASED ON THEIR TRIFLUOROMETHANESULFONATES IN ASYMMETRIC DIELS-ALDER REACTIONS

Authors
KOBAYASHI S ISHITANI H ARAKI M HACHIYA I
Citation
S. Kobayashi et al., CHARACTERIZATION OF CHIRAL YTTERBIUM AND SCANDIUM CATALYSTS BASED ON THEIR TRIFLUOROMETHANESULFONATES IN ASYMMETRIC DIELS-ALDER REACTIONS, Tetrahedron letters, 35(34), 1994, pp. 6325-6328
Citations number
16
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Tetrahedron letters → ACNP
ISSN journal
00404039
Volume
35
Issue
34
Year of publication
1994
Pages
6325 - 6328
Database
ISI
SICI code
0040-4039(1994)35:34<6325:COCYAS>2.0.ZU;2-Y
Abstract
The unique structure of chiral ytterbium and scandium catalysts (prepa red from ytterbium or scandium trifluoromethanesulfonate, (R)(+)-binap hthol, and a tertiary amine) was determined. The structure was charact erized by hydrogen bonds between the phenolic hydrogens of (R)(+)-bina phthol and the nitrogens of the tertiary amines. Aging and aggregation of the catalysts are also reported.