✍ Scribed by Higashi, Fukuji ;Yamada, Yukiharu ;Hoshio, Atsushi
No coin nor oath required. For personal study only.
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‐dimethylformamide (DMF), N,N‐dimethylformamide, and N,N‐dimethylacetamide were favorably used. A Vilsmeier adduct thus derived from DPCP and DMF was very effective especially for the preparation of high‐molecularweight copolyesters from hydroxybenzoic acids. Copolymers of several combinations of hydroxybenzoic acids were prepared and their solubility and thermal properties were investigated. The polycondensations of aromatic dicarboxylic acids and bisphenols with the adduct were also studied.
📜 SIMILAR VOLUMES
It is known that N-phenylanthranilic acids can be synthesized by Ullmann-Goldberg condensation in different conditions. This paper reports some parameters which influence the condensation and reports a general procedure for this reaction using N,N-Dimethylformamide as solvent.
## Abstract A Vilsmeier adduct derived from arylsulfonyl chlorides and DMF in pyridine was successfully used as a new condensating agent for the synthesis of aromatic polyesters by the direct polycondensation of aromatic dicarboxylic acids and bisphenols and also of hydroxybenzoic acids. Polymers o