Abstract

K. R. Sankaran* and C. Anbuselvan

The kinetics of manganese (II) triacetate dihydrate oxidation of thiosemicabazones of benzaldehyde and acetophenone have been studied in 90% acetic acid at 30 ± 0.20C. The reaction exhibits total second order kinetics - first order in each reactant. The rates of these reactions are susceptible to electronic influences of substituents on the phenyl ring. To account for the negative Hammett reaction constant (P = -2.15) in the case of acetophenone and substituted acetophenones. a rate determining cleavage of N-Mn" bond has been proposed. At ambient temperature manganese (III) acetate regenerates the corresponding carbonyl compounds in about 86% yield.

Thiosemicabazones; benzaldehyde; acetophenones carbonyl

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