2.3.4- Tri-O-methyl-L-arabinitol

Copolyurethanes based on L-arabinitol and 2,2 -dithiodiethanol have been obtained by polyaddition reaction of mixtures of 2,2 -dithiodiethanol (DiT) and 2,3,4-tri-O-methyl-L-arabinitol (9) or 2,3,4-tri-O-benzyl-L-arabinitol (11) to 1,6 hexamethylene diisocyanate (HDI) [118]. 

Galbis et al. described a variety of carbohydrate-based linear polyesters 61 of the poly(alkylene dicarboxylate) type that were obtained by polycondensation reactions of the alditols 2,3,4-tri-(9-methyl-L-arabinitol (9) and 2,3,4-tri-O-methyl-xylitol (10), and the aldaric acids 2,3,4-tri-(9-methyl-L-arabinaric acid (26) and 2,3,4-tri-(9-methyl-xylaric acid (27), butanediol, and adipic acid were also used as comonomers [28]. Copolyesters of the poly(aIkylene-c )-arylene dicarboxylate) type were obtained using bisphenols as comonomers (Scheme 1). Chemical polycondensation reactions were conducted in bulk or in solution. Enzymatic polycondensation reactions of adipic acid with the above-mentioned alditols were carried out successfully using Lipozyme and Novozyme 435. The hydrolytic degradations of some of these polyesters were also described. 

Figure 8. A photograph of a GLC pattern of partially methylated alditol acetates from the trisaccharide of glucose and arabinose. 2,5-A - 1,3,4-tri-O-acetyl-2,5-di-0-methyl arabinitol 2,3,4,6-G - 1,5-di-0-acetyl-2,3,4, 6-tetra-O-methyl glucitol 2,4-A - l,3,5-tri-0-acetyl-2,4-di-0-methyl arabinitol 2,3,6-G - l,4,5-tri-0-acetyl-2,3,6-tri-0-methyl glucitol. (Reproduced with permission from Ref. 30. Copyright 1988 Academic Press.)...

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