Note that the chemical shift of the 13C-OH signal for the parent compound X6H6 (1) is much lower (i.e., 147.2 ppm) (CDCl3, 298 K), suggesting the presence of strong intramolecular H-bonds in the case of compound 3, see: Gutsche CD, Dhawan B, No KH, Muthukrishnan R.
J. Am. Chem. Soc. 1981;
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