N-METHYLPYRROLIDONE SOLVENT IN PREPARATION OF PYROMELLITATES

N-METHYLPYRROLIDONE SOLVENT IN PREPARATION OF PYROMELLITATES

N-METHYLPYRROLIDONE SOLVENT IN PREPARATION OF PYROMELLITATES An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using N-methylpyrroli-done solvent. In particular, pyromellitic dianhydride in N-methylpyrrolidone solvent is esterified to the diester/ diacid by 2-(n-pe...

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Bibliographische Detailangaben
Hauptverfasser: OXENRIDER, BRYCE C, MARES, FRANK
Format: Patent
Sprache:eng ; fre
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:N-METHYLPYRROLIDONE SOLVENT IN PREPARATION OF PYROMELLITATES An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using N-methylpyrroli-done solvent. In particular, pyromellitic dianhydride in N-methylpyrrolidone solvent is esterified to the diester/ diacid by 2-(n-perfluoroalkyl)ethanols having six to twelve carbon atoms in the perfluoroalkyl groups, and the reaction mixture containing the dissolved diester/diacid is admixed with an oxirane compound of the group ethylene oxide, epichlorohydrin and glycidol whereby the carboxyl groups are esterified in the N-methylpyrrolidone solvent by reaction with oxirane groups.