Method for the preparation of 5-carboxyphthalide
US6403813B1 · kind B1 · utility
14Cited by
9References
6Claims
0Family size
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Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Oct 19, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/88
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acid with paraformaldehyde HO(CH2)nH in oleum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.