Intermediates for preparing hydroxyphenylpyridazinones
US4272440A · kind A · utility
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2References
2Claims
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Key dates
| Filing date | Feb 2, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Feb 2, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
5-(5'-Halo-2'-methoxyphenyl)-3,4-dihalo-2(5H)-furanones are prepared by a Friedel-Crafts reaction using a p-haloanisole and a mucohalic acid in the presence of aluminum chloride. They are used as chemical intermediates for preparing hydroxyphenylpyridazinones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.