New poly(phenylquinoxaline)s by reaction of biphenols with 2,3‐bis (4‐fluorophenyl) quinoxaline

Thianthrene as an activating group for the synthesis of poly(aryl ether thianthrene)s by nucleophilic aromatic substitution

“…The larger the positive charge is at the ipso carbon, the higher the reactivity is toward S N Ar. Semiempirical molecular orbital calculations with Hückel41, 42 and restricted Hartree–Fock5 methods have been used as indicators of reactivity. The second method of gauging the electron‐withdrawing character of the activating group uses spectroscopic methods involving 1 H, 13 C, and 19 F NMR shift values 5, 6, 15, 43, 44…”

Poly(aryl ether) Synthesis

“…Many pendent heterocyclic rings activate halo-displacement by analogy to ketone and sulfone groups. The quinoxaline ring system has been shown to activate fluoro-displacement from phenyl groups substituted at the 3-position of the quinoxaline (74,75). The reactivity at the pendent phenyl ring was observed to be somewhat lower than the fused ring for fluoro-displacement.…”

Poly(arylene ether)s, poly(arylene thioether)s, and poly(arylene sulfone)s derived from a dihydroxy(imidoarylene) monomer

“…Several Poly(arylene ether)s, poly(arylene thioether)s years ago a novel bisphenol monomer containing and poly(arylene sulfone)s are three classes of a pendent imide group was synthesized in this high-performance polymers with the characterislaboratory from phenolphthalein and a series of tics of good thermo-oxidative stability, high glass poly(arylene ether)s were synthesized from it by transition temperatures, and excellent mechania nucleophilic substitution reaction. [3][4][5] The polycal strength. 1 Polyimides, such as Kapton pro-(arylene ether)s obtained had extremely high duced by duPont, are another class of important glass transition temperatures, good thermal stahigh-temperature polymers.…”