Abstract The kinetics of reactions of 4-substituted benzoyl, cinnamoyl and phenyl isothiocyanates with aliphatic amines and glycine ethyl ester in organic solvents was studied by the stopped-flow and UV spectroscopic methods. The reaction of acyl isothiocyanates with the nucleophilic reagents employed proved to be 10 3-10 4 times faster than analogous reaction of phenyl isothiocyanates. A linear correlation between logk and σ p constants ...