M. Buxton, J. Tilney-Bassett, R. H. Mobbs
1965
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Abstract
Abstract : Preparations and synthetic studies have been carried out on difluoropyromellitic acid, tetrafluoroisophthalic acid, tetrafluorophenylene diamines, 3,3',4,4'-tetra-substituted-hexafluorobiphenyls, tetra- fluororesorcinol, sulphides, dithiols, and 2,3,5,6-tetrafluorobenzoic acid. The above, with other perfluorinated aromatic compounds were employed in the synthesis of perfluorinated aromatic model compounds and polymers. The hydrogenic analogues were also prepared for comparison of thermal and thermo- oxidative stabilities. Model compound structures include bibenzoxazoles, oxadiazoles, sulphonic esters, dithiocarbonates, amides, and imides, for which thermal decomposition temperatures are reported. Polymer structures include carbonates, hydrazides, and imides. Synthetic routes to perfluoro aralkyl compounds are being investigated. Starting materials are tetrafluorobenzene, octafluorobiphenyl, and perfluoroaliphatic aldehydes. Synthetic routes to perfluoro cyclohexyls via reactions of phenyl and pentafluorphenyl lithium with decafluorocyclohexene and o- and p- perfluoroxylene have been studied. Studies have been made of routes to pentachloropyridine, for the exchange reaction with potassium fluoride to yield pentafluoropyridine.