Synthesis and properties of 10hydroxy10oxo10H10λ5 phenoxaphosphine2,8dicarboxylic acid and related polybenzoimidazolesстатья
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Дата последнего поиска статьи во внешних источниках: 28 марта 2018 г.
Аннотация:Oxidation of 10hydroxy2,8dimethyl10H10λ5phenoxaphosphine 10oxide (1) with
potassium permanganate in an alkaline medium afforded 10hydroxy10oxo10H10λ5
phenoxaphosphine2,8dicarboxylic acid (2). The latter exists as a stable crystal hydrate con
taining two water molecules. With the aim of examining the possibility of performing the
synthesis of polybenzoazoles based on acid 2, the model reaction of the latter with ophe
nylenediamine in polyphosphoric acid (PPA) was studied. New highmolecularweight phos
phoruscontaining polybenzoimidazoles were prepared by the reaction of 2 with various aro
matic tetraamines in PPA and Eaton’s reagent.