Optical resolution process for DL-cysteine
US4613688A · kind A · utility
4Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1982 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | Apr 2, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the optical resolution of DL-cysteine which comprises PA1 (1) converting DL-cysteine into a hydrochloride thereof and forming a saturated or supersaturated aqueous solution thereof, PA1 (2) inoculating the solution with crystals of one optically active form of cysteine hydrochloride as seed crystals, and PA1 (3) preferentially crystallizing optically the same form of the cysteine hydrochloride used as the seed crystals, in a state of a monohydrate thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.