Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and process for the preparation thereof
US4925959A · kind A · utility
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1Claims
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Assignee
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Key dates
| Filing date | May 9, 1989 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | May 9, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C65/11
- 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-carboxylic 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.