Dinitrophenyl N, N-Dialkyldithiocarbamates J. Org. Chern., Vol. 44, No. 2, 1979 267 but significant deviation from the Brginsted relationship for strongly basic thiols. The slope for weakly basic thiols (excluding thioacetic acid29) is 0.65, corresponding to a &,, of-0.35 for anion attack on the protonated semicarbazone. It has been shown that aliphatic and aromatic thiol anions exhibit no systematic differences in nucleophilic behavior toward ...