Method for the production of N-cyclic and N,N'-dicyclic ureas and their use as chemical solvents
US5414083A · kind A · utility
66Cited by
3References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 24, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D295/215
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or bis ureas wherein at least one of the urea's nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom by means of dialkylating the --NH.sub.2 group of a urea with an alkene or alkene arylene alkene dihalogenide, disulphonate or dihydrogen sulphonate in the presence of a solid base and a phase-transfer catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.