Process for the production of pyranthrones or flavanthrones
US4182882A · kind A · utility
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4References
10Claims
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Assignee
Inventors
Key dates
| Filing date | Mar 13, 1978 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Mar 13, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B3/42
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the production of pyranthrones or flavanthrones which comprises reacting substituted or unsubstituted 2,2'-dialkyl-1,1'-dianthraquinonyls or 2,2'-diacylamino-1,1'-dianthraquinonyls respectively in a two-phase system of aqueous organic solvents using quaternary ammonium or phosphonium compounds as catalysts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.