Method for preparing 2,5-dipcryl-1,3,4-oxadiazole
US4777258A · kind A · utility
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6Claims
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Key dates
| Filing date | Apr 23, 1987 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | Apr 23, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D271/107
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing 2,5-dipicryl-1,3,4-oxadiazole by reacting N,N'-bi,4,6-trinitrobenzoyl)hydrazine with phosphorus pentachloride in a chlorinated hydrocarbon which is 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1,2-trichloroethylene, or a mixture thereof at a temperature of from 70.degree. C. to the reflux temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.