1-(4'-Diazoniumphenyl)-pyridinium salts and the process of preparation
US3985724A · kind A · utility
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3References
7Claims
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Key dates
| Filing date | Oct 15, 1974 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Oct 15, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B43/44
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel diazonium compounds and methods for their preparation are disclosed. Specifically, 1-(4'-diazoniumphenyl)-1,2-dihydro pyrid-2-imino-sulfinate is prepared by rearrangement of 2-(4'-diazobenzene-sulfonylamino)-pyridine, and 1-(4'-diazoniumphenyl)-2-amino-pyridinium salts are obtained by reaction of 1-(4'-diazoniumphenyl)-1,2-dihydro-pyrid-2-imino-sulfinate with aqueous acids. The novel compounds are useful as precursors for azo dyestuffs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.