Dihydrazides polyhydrazides

Carbazole-containing PODs have been obtained (53) by cyclodehydration (in the presence of POCl3) of polyhydrazides prepared by polycondensation of IV-ethyl-3,6-carbaZoledicarbonyl chloride with dihydrazides of the corresponding dicarboxylic acids. Thermal decomposition of the polymers containing aliphatic units occurs at 365-380°C, compared to 400-405°C for polymers containing aromatic units. [Pg.534]

The synthesis of phenoxaphosphine-containing PODs by the cydodehydration of polyhydrazides obtained from 2,8-dichloroformyl-10-phenylphenoxaphosphine-10-oxide and aliphatic and aromatic dihydrazides has been described (60). All polymers are soluble in formic acid, -cresol, and cone H2S04, but insoluble or partially soluble in benzene, chloroform, and hexamethylphosphoric triamide. [Pg.535]

Di(chlorocarbonyl)pyrazine with isophthalic dihydrazide in A -methyl-pyrrolidinone gave the polyhydrazide (1427). [Pg.284]

Polymer G is the aromatic polyhydrazide from terephthalic dihydrazide and terephthaloyl chloride -t-NHNHCO CONHNHCO CO. ... [Pg.459]

Polyhydrazides were prepared by the general procedure of Frazer (1) from dihydrazides and diacid chlorides in amide solvents (Fig. 1) ... [Pg.20]

In addition to low molecular compounds, polyhydrazides of 3,3 -thiodipropionylhydrazide have been proposed as metal deactivators (6). These compoimds can be manufactured by the reaction of a 3,3 -thiodipropionic acid dihydrazide with a suitable bis(acid chloride). [Pg.167]

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