Pyridazinone manufacture
US5010192A · kind A · utility
1Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Sep 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D237/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids, which comprises the step of decarboxylating a 4-oxo-3, 5-pyridazine dicarboxylic acid to give a 4-oxo-5-pyridazine carboxylic acid by treatment with 95-100% sulphuric acid at 160.degree.-180.degree. C. using a reactant; acid weight ratio of about 1:4 to 1:10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.