Abstract: ¹H NMR Meerwein's ester (1,3,5,7-tetracarbomethoxybicyclo[3, 3, 1] nona-2, 6-diene-2,6-diol) (I) has been measured as a function of the mole fraction of benzene in the mixed solvent of bezene and caron tetrachloride. As the mole fraction of benzene in creases, the chemicalshifts (δ) of two different methyl groups in a molecule and of benzenegradually move upfield. The rate of upfield shifts of differently located methyl groups in a molecule differs from each other. The △δ of originally lowerfield methyl group is larger than that of originally upperfield methyl group, so the two resonance lines appear to overlap and cross over with the increment of the fraction of benzene in the mixed solvent. All of the chemical shifts can be related by a linear equation δ=A+BX, where, X is the mole fraction of benzene in the mixed solvent.

Key words: Meerwein's ester, ASIS effect, Overlap, Solvation, Linear correlation