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Acid anhydrides have been used to carry out the regioselective acylation of primary hydroxyl group in benzyl 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate and 4-fluorobenzyl 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate and deacylation of their diesters in the presence of Lipozyme ® TL IM in diisopropyl ether. Amongst different acid anhydrides used, butanoic anhydride was found to be the best acylating agent as compared to others. Both acylation and deacylation reactions were highly selective and efficient yielding exclusively the monoacylated products in 70–88 % yields. Graphical Abstract

The use of enzymes in synthetic applications has increased dramatically in the recent years and the field of polymer science is part of this trend. Synthesis of a variety of polymers using lipase catalyzed (Candida antarctica) polymerization reactions has led to a variety of new materials with interesting properties in our laboratories. This paper describes the synthesis of multi-component polyesters and mixed polymers having polyester and polyamide linkages under solvent-less conditions using Candida antarctica lipase B. The effect of a third component, i.e. a series of 1,omega-alkanediols (1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, 1,14-tetradecanediol and 1,16-hexadecanediol) on the copolymerization reaction of dimethyl 5-hydroxyisophthalate with poly(ethylene glycol 600) has been studied and the mechanism for the incorporation of the third component is proposed. We have also studied the effect of different functional groups during terpolymerization reaction of dimethyl 5-hydroxyisophthalate with poly(ethylene glycol) by adding a third component having different functionalities (1,6-hexanediol, 1,6-hexanediamine or 1,6-hexanedithiol) and compared the effect of hydroxyl, amine and thiol groups on the polymerization reactions.

Acid anhydrides have been used to carry out the regioselective acylation of primary hydroxyl group in benzyl 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate and 4-fluorobenzyl 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate and deacylation of their diesters in the presence of Lipozyme.sup.® TL IM in diisopropyl ether. Amongst different acid anhydrides used, butanoic anhydride was found to be the best acylating agent as compared to others. Both acylation and deacylation reactions were highly selective and efficient yielding exclusively the monoacylated products in 70-88 % yields.