Process for the preparation of 3-(3,5-dichlorophenyl)-hydantoin
US4099008A · kind A · utility
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7Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 12, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Aug 12, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/72
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the manufacture of 3-(3,5-dichlorophenyl)-hydantoin comprises cyclizing 3-(3,5-dichloro-phenyl)-ureidoacetic acid in the presence of a catalytic amount relative to the ureidoacetic acid of an acid dehydrating agent and in the presence of an organic solvent which forms an azeotrope with water; the water formed during the reaction is eliminated by azeotropic distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.