Selective synthesis of alky poly-β- d-glucopyranoside over mixed metal oxide

Abstract

Glycosylation reactions are most commonly encountered in nature. Synthetically, glycosylation is carried out with Lewis acid catalyst, HF, AlCl 3 or mineral acids. However environmental threat associated with such catalysts has encouraged process modification and the development of solid catalyzed glycosylation reactions, which are commercially viable as well. In this contribution comparative study of glycosidic bond formation of simple d-glucose with several fatty alcohols (C 8–C 14) over variety of mixed metal oxidic spinels (CuFe 2O 4, ZnFe 2O 4, CoFe 2O 4 and NiFe 2O 4, 10% (w/w) ZnFe 2O 4 supported on SiO 2 and ZrO 2) is taken up to evaluate the performance of this potential catalysts system. Effect of catalyst preparation was evaluated. This replacement of homogeneous acid catalyst by oxidic spinels shows alkyl poly β- d-glucopyranoside as major product at comparatively low temperature range. The effects of variety of parameters were studied in a batch reactor. The mechanism of the reaction over mixed metal oxidic spinels at 363 K is put forth.