Imidazolium cations and processes for their preparation
US5969150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1998 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D491/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel imidazolium compounds and improved processes for the preparation of imidazolium cations with one or more imidazolium moieties optionally substituted with the same or different substituents, which are prepared from a reactant with at least one N--C--C--N group, by reacting with with an N-substituted or N,N-disubstituted thioformamide, formamide acetal or thioformamide acetal, in the presence of a halogenating agent. Examples of suitable halogenating agents include but are not limited to thionyl chloride, phosgene, and phosgene derivatives. Reactants containing more than one additional N--C--C--N group may also be used to prepare compounds with two or more imidazolium groups, by the procedures of the present invention. Certain compounds of the invention prepared from reactants with multiple N--C--C--N groups may have both unreacted N--C--C--N moieties and substituted imidazolium groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.