Aqueous hexasubstituted guanidinium chlorides and methods for their preparation and use
Patent 6235934 Issued on May 22, 2001. Estimated Expiration Date: 
December 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesBis(pentaalkylguanidinium) alkane salts as phase transfer catalysts Method for conducting organic reactions using guanidinium salt as phase transfer catalyst Process for the manufacture of 1-bromoalkyl hydrocarbyl carbonates Phase transfer catalyzed preparation of aromatic polyether polymers Patent #: 5229482 Inventors
ApplicationNo. 216252 filed on 12/17/1998US Classes:564/241, Guanidine per se or salt thereof548/473, Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., phthalimides, etc.)548/485, Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., isatins, etc.)564/230, Guanidines (i.e., HN=C(-HNH)-HNH, wherein substitution may be made for hydrogen only)564/237, Benzene ring containing564/240AcyclicExaminersPrimary: Kumar, ShailendraAttorney, Agent or FirmInternational ClassC07C 279/02AbstractHexasubstituted 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.Other References
Field of SearchBenzene ring containingGuanidine per se or salt thereof Guanidines (i.e., HN=C(-HNH)-HNH, wherein substitution may be made for hydrogen only) Acyclic Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., isatins, etc.) Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., phthalimides, etc.) |
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