Process of preparing 2,2'-(1-methyl-1,2-ethanediylidene) bis[hydrazinecarboximidamide]
US5659083A · kind A · utility
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Key dates
| Filing date | May 30, 1996 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | May 30, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C281/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of 2,2'-(1-methyl-1,2-ethanediylidine)bis[hydrazine carboximidamide] by PA1 a) removing impurities from aminoguanidine bicarbonate; PA1 b) reacting the aminoguanidine bicarbonate with methylglyoxal dimethyl acetal in an aqueous isopropyl medium; and PA1 c) purifying the 2,2'-(1-methyl-1,2-ethanediylidene)bis[hydrazine carboximidamide] by crystallization from an acidic aqueous-isopropanol medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.