Process for preparing substituted phthalic anhydrides
US4559405A · kind A · utility
11Cited by
3References
8Claims
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Inventor
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Apr 16, 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 bromine in the presence of an acid acceptor. Typical acid acceptors include dimethylformamide and pyridine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.