Abstract
Phenylhydrazonopropanedinitriles react with aliphatic thiols in aqueous solutions to give 2-phenylhydrazono-3-imino-3-alkylthiopropanedinitriles. The observed first-order rate constants kobs (s-1) depend on pH value of the reaction medium and on the thiol concentration. Kinetic analysis showed that the reactions are nucleophilic additions of bimolecular type involving non-dissociated phenylhydrazonopropanedinitriles and thiolate anions as the electrophilic and nucleophilic partners, respectively. A relation is given enabling transformation of the found kobs constants into the second-order rate constants k (1 mol-1 s-1) independent on the pH value of medium and of the thiol concentration.
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