✍ Scribed by Kokelenberg, Hendrik ;Marvel, C. S.
No coin nor oath required. For personal study only.
In an attempt to synthesize soluble polymers, diphenyl 1,5‐anthraquinonedicarboxylate was treated with 3,3′‐dimercaptobenzidine and 3,3′‐diaminobenzidine under various conditions. Although the ester reacted readily, side reactions prevented the formation of high molecular weight compounds. It was thought that at the elevated temperatures required for reaction, the quinone group was involved in a type of Schiff's base formation. The thermal stability of the polymers was evaluated. Model compounds were prepared and their absorption spectra were compared with those of the polymers. It was observed that 1,5‐anthraquinonebibenzimidazole‐2 formed a stable product with acetic acid. Some of the polymers could be solubilized by reduction with sodium dithionite in alkali, but no useful fibers were produced from these solutions.
📜 SIMILAR VOLUMES
## Abstract A preparation for 1,2,5,6‐tetraaminoanthraquinone was worked out. The reactivity of this compound in nucleophilie substitutions and nucleophilic additions was studied. Polymers were made by condensation with pyromellitic anhydride, terephthaloyl chloride, and isophthaloyl chloride. The
## Abstract In an attempt to prepare polymers which might be oxidized to compounds soluble in alkali diphenyl 1,5‐anthracenedicarboxylate was reacted with diaminobenzidine, dimercaptobenzidine, and diaminobiphenol in the melt and with dimercaptobenzidine dihydrochloride in polyphosphoric acid. Comp
## Abstract Four ladder or partial ladder polypyrrolones containing anthraquinone recurring units have been synthesized by condensing the dianhydride of 1,2,5,6‐bis(α,β‐dicarboxyl‐pyrazino)anthraquinone with four different tetraamines, 1,2,4,5‐tetraaminobenzene tetrahydrochloride, 3,3′,4,4′‐tetraam
## Abstract 1,2,5,6‐Tetraaminoanthraquinone has been condensed with isophthalaldehyde and terephthalaldehyde and their bisulfite addition compounds to yield new heat‐stable polymers. It has also been condensed with pyromellitic anhydride to give the pyrrolone. The highest viscosities were obtained