Method for the preparation of 2,6-naphthalene dicarboxylic acid
US4764638A · kind A · utility
5Cited by
2References
22Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 12, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Aug 12, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/265
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a method for the preparation of 2,6-naphthalene dicarboxylic acid from 2-acyl-6-alkyl naphthalene, especially 2-acetyl-6-methylnaphthalene, by oxidation in two steps with oxygen or air. The catalyst in the first oxidation is based on manganese. The catalyst in the second oxidation is based on cobalt with bromine added. The addition of 6-alkyl-2-naphthoic acid to the reaction in the second oxidation, in portions or in a continuous manner, results in very good yields having high purities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.