Process for preparing substituted phthalic anhydrides
US4564687A · kind A · utility
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2References
12Claims
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Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/567
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, in which the Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride is reacted with sulfuryl chloride in the presence of pyridine and an optional solvent, e.g. chlorobenzene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.