In this paper

a phase-transfer catalyzed rnetod for synthesis of three thio-disaccharides-his (2

3

4

6-tetar-O-acetyl-O-acetyl-β-D-glucopyranosyl sulfide (1 )

bis (2

3 f 4

6-tetra-O-acetyl-β-D-galactopyranosyl) sulfide (2)

and his (2

3

4

6-tri-O-acetyl-β-D-xylopyranosyl ) sulfide (3) is described.The precent yields of 1 and 2 are higher than the literature. Compound 3 is a new thio-disaccharide

its structure was confirmed depending upon the elemental analysis and IR

1H-NMR spectra dada.