Diphosphines containing silane groups, immobilized diphosphines and the use thereof as hydrogenation catalysts
US5432289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1994 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Sep 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Compounds of formula I ##STR1## wherein R.sub.1 denotes identical or different radicals and is linear or branched C.sub.1 -C.sub.12 alkyl, unsubstituted C.sub.5 -C.sub.6 cycloalkyl or C.sub.5 -C.sub.6 cycloalkyl which is substituted by C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, or is phenyl or benzyl, or both substituents R.sub.1 of a group (R.sub.1).sub.2 P are o,o'-diphenylene, R.sub.2 is hydrogen, linear or branched C.sub.1 -C.sub.12 alkyl, phenyl or benzyl, R.sub.3 is C.sub.1 -C.sub.12 alkylene, R.sub.4 is C.sub.2 -C.sub.18 alkylene, phenylene or benzylene, and R.sub.5 is C.sub.1 -C.sub.6 alkyl or phenyl, can be applied to solid carriers, such as silica gel or aerosils, and complexed with rhodium or iridium compounds. These materials are heterogeneous and separable catalysts for the asymmetrical hydrogenation of prochiral compounds containing carbon double bonds or carbon/hetero atom double bonds, for example ketones and imines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.