Aqueous hexasubstituted guanidinium chlorides and methods for their preparation and use
US6235934A · kind A · utility
11Cited by
4References
8Claims
0Family size
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Key dates
| Filing date | Dec 17, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Dec 17, 2018 |
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 for 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.