Process for manufacturing crystal violet lactone
US4076728A · kind A · utility
7Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1977 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Mar 17, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/885
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Crystal Violet Lactone (CVL) is produced in high yield and highly pure form by a process comprising condensing Michlers hydrol with 3-dimethylaminobenzoic acid to form leuco CVL, extracting the reaction mixture containing the leuco CVL with an aromatic hydrocarbon solvent, such as toluene, or a mixture of such a solvent and a water-immiscible alkane, such as heptane, to remove impurities therefrom and treating the extracted reaction mixture with an inorganic oxidizing agent to convert the leuco CVL to CVL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.