The effect of copper, managanese and cobalt acetates on the autoxidation oftrans‐9,trans‐11‐octadecadienoic acid in 90% v/v aqueous acetic acid

Abstract

AbstractThe autoxidation oftrans‐9,trans‐11‐octadecadienoic acid in 90% v/v aqueous acetic acid has been studied, at 80 C, with and without copper, manganese and cobalt acetate. The initial 9,11‐octadecadienoic acid concentration was 0.05 M in most of the experiments. The metallic acetate concentrations were 10−5 to 10−2 M. Copper and manganese acetates retard the autoxidation. With copper acetate, this retardation involves both the induction period and the rapid autocatalytic stage. Manganese acetate prolongs the induction period. A slightly lowered rate is observed at low cobalt acetate concentrations (∼10−5 M), but higher cobalt acetate concentrations clearly accelerate the autoxidation.