Aqueous hexasubstituted guanidinium chlorides and methods for their preparation and use
US5872294A · kind A · utility
7Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1996 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Jan 11, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C277/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Hexasubstituted guanidinium chlorides are prepared by a method which affords them in high yield as aqueous solutions, optionally also containing alkali metal chlorides. The solutions may be employed as sources of hexasubstituted guanidinium salts useful as phase transfer catalysts and the reaction of alkali metal salts of dihydroxyaromatic compounds with substituted imides to form polyetherimides or their intermediates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.