Direct polycondensations of hydroxybenzo
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Higashi, Fukuji ;Yamada, Yukiharu ;Hoshio, Atsushi
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Article
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1984
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John Wiley and Sons
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## Abstract Direct polycondensation reaction of hydroxybenzoic acids with diphenyl chlorophosphate (DPCP) in pyridine was largely improved by carrying out the reaction in the presence of a formamide. Among the formamides examined, __N__,__N__βdimethylformamide (DMF), __N__,__N__βdimethylformamide,