Abstract: This article studies the solvent effect of benzene on the NMR sprctra of title compound in carbon tetrachloride. It has been found that the chemical shifts of the resonance absorption lines of the two methylthio groups in title compound and that of benzene in the mixed solvent move upfield gradually,as the mole fraction of benzene in the mired solvent increases. The rates of upfield shifts of the reso-nance absorption lines of the two methylthio groups are different, and as the mole fraction of benzene increases, the ASIS increases. All the chemical shifts and ASIS show linear relationships with the mole fraction of benzene in the mixed solvent. It has been tried to use the solvation to explain the ASIS effect of benzene on title compound.

Key words: ¹H NMR, Mixed solvent, Chemical shifts, Solvation, ASIS effect