SYNTHESIS OF A STEREOREGULAR POLY(ESTER AMIDE) DERIVED FROM L-ARABINOSE

L-Arabinose was transformed into 2,3,4-tri-O-methylarabinonamide which , by reduction, gave the corresponding 1-aminoarabinitol derivative. V ia blocking group manipulations, a selective succinylation at C-5, and activation, the precursor 7 could be obtained, which was used to synt hesize a new type of stereoregular poly(ester amide) that displays opt ical activity. The polymerization reaction was carried out in differen t polar solvents, and the polymers were characterized by elemental ana lysis, IR, and H-1 and C-13 NMR. Both viscosimetry and GPC were used t o estimate the molecular weights. Thermal studies revealed that the di fferent samples of this poly(ester amide) melt above 135 degrees C, be ing stable up to 250 degrees C under nitrogen.