Exchange processes of diastereotopic protons of α-chlorodibenzyl sulfides were observed by means of dynamic nuclear magnetic resonance. Polar effects of solvents and substituent effects on the ease of the exchange process of protons in p, p′-disubstituted α- chlorodibenzyl sulfides indicate that the process occurs with the dissociation of the compounds into benzylic cations and chloride ion. It is possible to measure the rates of ...