Process for production of 2-pyrazolin-5-ones
US4931565A · kind A · utility
7Cited by
1References
4Claims
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Key dates
| Filing date | Apr 20, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Apr 20, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D409/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for production of 2-pyrazolin-5-ones having the formula (I): ##STR1## which comprises cyclizing hydrazone derivatives having the formula (II): ##STR2## in the presence of a base; wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a specific group; compounds having the formula (I) as well as compounds having the formula (II) and a process for production thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.