Process for the preparation of a dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid
US5047558A · kind A · utility
0Cited by
3References
4Claims
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Assignee
Inventors
Key dates
| Filing date | Feb 14, 1990 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Feb 14, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D319/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to the dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid which adduct comprises 1 mol of 1,4-dioxane and about 2 mol of 2-hydroxynaphthalene-6-carboxylic acid per mol. The invention further relates to a process for the preparation of this adduct, wherein the 2-hydroxynaphthalene-6-carboyxlic acid is dissolved in dioxane or a mixture thereof with water or with an organic solvent and then allowed to crystallize.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.