ISSN:
1434-193X
Schlagwort(e):
Nonlinear effects
;
Asymmetric catalysis
;
Ruthenium complexes
;
Atropisomeric phosphanes
;
Hydrogenation
;
Chemistry
;
General Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
A strong positive nonlinear effect (asymmetric amplification) was found to take place during asymmetric hydrogenations using chiral atropisomeric diphosphane-ruthenium catalysts. As an example, at atmospheric pressure the use of 50% ee BINAP to prepare [(binap)Ru(Br)2] give rise to a hydrogenated product with 91% ee. The influence of temperature and hydrogen pressure on this effect are presented. These nonlinear effects can be explained on the basis of a hydrogenation mechanism in which diastereomeric dimers as pre-catalytic species are present.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
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