Purification of robenidine hydrochloride
US3980705A · kind A · utility
0Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1975 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | May 19, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C281/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A superior grade of 1,3-bis(4-chlorobenzylideneamino)-guanidine hydrochloride is obtained by dispersing crude material in a suitable solvent, slowly adding to the dispersion an amount of base at least equivalent to the number of moles of 1,2,3-tris(4-chlorobenzylideneamino)guanidine hydrochloride present in said crude 1,3-bis(4-chlorobenzylideneamino)guanidine hydrochloride, separating the purified 1,3-bis(4-chlorobenzylideneamino)guandidine hydrochloride therefrom, and washing and drying the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.