Preparation of monosubstituted dithiooxamide compounds
US5041654A · kind A · utility
4Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Nov 17, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/132
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to the synthesis of N-(monosubstituted)dithiooxamides by the transamination of dithiooxamide. Preferred methods, according to the present invention, take advantage of the discovery that yields of N-(monosubstituted)dithiooxamides can be improved in the Wallach Reaction by: controlling the temperature of the reaction mixture; optimizing the initial concentration of the reactants; adding an effective amount of acid in the quenching or processing procedure; and/or, optionally, adding an effective amount of certain nitrogen bases to the reaction mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.