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- W2043583861 abstract "Abstract Carbohydrate-containing copolyhydrazides were synthesized by the reaction of 2,3,4,5-tetra-O-acetyl galactaroyl dichloride with typical dibasic aromatic and aliphatic acid dihydrazides, viz. terephthaloyl dihydrazide (4) succinoyl dihydrazide and oxalyldihydrazide (6), using low temperature solution polycondensation in N,N-dimethylacetamide. The maximum viscosity and yield of the copolyhydrazide derived from 4 were obtained for reactant concentration of 0.5 mol/l at −10°. The optimum conditions for the copolyhydrazide derived from 6 were obtained at reactant concentration of 1.0 mol/l at −5°. Copolyhydrazides containing unacetylated carbohydrate chains were obtained by de-O-acetylation of the acetylated polymers with methanolic ammonia. Copoly{1-[2-(2,3,4,5-tetra-O-acetyl-galacto-tetritoldi-1,4-yl)-5-(1,3,4-oxadizol-di-2,5-yl)]-4-[2-(1,3,4- oxadiazol-di-2,5-yl)-benzene]} was prepared by dehydrative cyclization of the corresponding copolyhydrazide using thionyl chloride. Structures of the synthesized polymers were confirmed by elemental analysis, i.r., and 1H-NMR. Thermal degradations of these polymers were studied by differential thermal analysis and thermogravimetric analysis." @default.
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- W2043583861 date "1990-01-01" @default.
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- W2043583861 title "Synthesis and characterization of carbohydrate-containing copolyhydrazides and copolyoxadiazoles" @default.
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- W2043583861 doi "https://doi.org/10.1016/0014-3057(90)90107-f" @default.
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