Synthesis of d-xylopyranan by the ring-opening polymerization of 3- O-benzyl-α- d-xylopyranose 1,2,4-orthopivalate. Attempts to synthesize a stereoregular polymer

Abstract

3- O-Benzyl-α- d-xylopyranose 1,2,4-orthopivalate ( 1) was newly synthesized and polymerized under cationic polymerization reaction conditions in order to synthesize stereoregular (1→4)-β- d-xylopyranan. Although the polymerization of orthopivalate 1 was carried out under various reaction conditions, a non-stereoregular polymer, but mainly consisting of (1→4)-β-xylopyranose units, was obtained. Comparing these results with those of glucose 1,2,4-orthopivalates, it was revealed that not only the substituents in the C-2 and C-3 positions, but also the CH 2OR group in glucose 1,2,4-orthopivalate, largely contribute to (1→4)-β-glucosidic bond formation by the ring-opening polymerization.