Two new bisphenols containing an oxadiazole ring, 2,5‐bis(p‐hydroxyphenyl)‐1,3,4‐oxadiazole and 2,5‐bis(m‐hydroxyphenyl)‐1,3,4‐oxadiazole, were synthesized starting from p‐ and m‐hydroxybenzoic acid and hydrazine. Polycarbonates having an inherent viscosity up to 0.5 were obtained by transesterification of the bisphenols with diphenyl carbonate. Similarly, aromatic polyesters were prepared from the corresponding diphenyl esters. These polycarbonates and polyesters were insoluble in all organic solvents, and indicated a high degree of crystallinity. The melting point of all the polymers containing oxadiazole rings were much higher than that of the polymers derived from bisphenol A.
No takes yet. Share an insight, caveat, or question.
Iwakura et al. (1966) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: