Chiralrhenium catalysts and processes for preparing the same
US5618958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel catalyst comprising the formula: EQU LRE(O)n wherein L is selected from the group consisting of (a) (R.sub.1)(AL) PA1 wherein R.sub.1 is an alkyl side chain containing at least one carbon-rhenium covalent bond, and PA2 AL is a molecule having C.sub.2 to C.sub.50, and has at least one hetero atom selected from the group consisting of N, O, S, and P wherein there is at least one hetero-rhenium dative bond, and has at least one chiral center. and (b) R.sub.AL is a straight or branched chain alkyl or arylalkyl group containing C.sub.2 to C.sub.50 and containing at least one heteroatom selected from the group consisting of N, O, S, and P, with the proviso that said alkyl group contains at least one carbon-rhenium covalent bond and at least one hetero-rhenium dative bond, and has at least one chiral center: and n is an integer which is 2, 3, 4, or 5 and which has utility in areas such as epoxidation of olefins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.