Process for the preparation of vitamin a, intermediates, and process for the preparation of the intermediates
US6552219B1 · kind B1 · utility
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4References
12Claims
0Family size
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Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are provided a dihalogen derivative represented by formula (2): wherein X represents a halogen atom and R2 represents a protective group for a hydroxyl group; a process for producing the same; and a process for producing vitamin A by use of said dihalogen derivative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.