Aa. Kassem, SYNTHESIS AND CHARACTERIZATION OF CARBOHYDRATE-COPOLYHYDRAZIDES CONTAINING ETHER BONDS IN THE MONOMER UNIT, Journal of macromolecular science. Pure and applied chemistry, A33, 1996, pp. 365-374
A series of carbohydrate-containing copolyhyrazides having ether bonds
were prepared by low temperature solution polycondensation. 2,3,4,5-t
etra-O-acetyl galactaroyl dichloride was polycondensed with hydroquino
ne-1,4-diacetic acid dihydrazide ((1) over bar), 2-bromo-,2-chloro, 2-
nirohydroquinone-1,4-diacetic acid dihydrazide ((2) over bar, (3) over
bar and (4) over bar, respectively) and isophthaloyl dihydrazide ((5)
over bar) in dimethylformamide and produced copolyhydrazides ((6) ove
r bar-<(10)over bar>), respectively. Copoly -oxadiazol-di-2,5-yl]-3-[2
-(1,3,4-oxadiazole-di-2, 5-yl)-benzene]} (<(11)over bar>) was synthesi
zed by dehydrative cyclisation of the polymer (<(10)over bar>) using t
hionyl chloride. Also, polymer (<(10)over bar>), under de-O-acetylatio
n in methanolic ammonia, gave the de-O-acetylated polymer (<(12)over b
ar>). All the present new polymers were characterized by elemental ana
lysis and i.r. and H-1-NMR spectroscopy. Their solubility, viscosity a
nd physical properties are studied.