The Autoxidation of Methyl Linoleate and Methyl Linolenate in the Presence of Cobalt(II) and Cobalt(III) Naphthanate in n-Heptane Solution

Abstract

Co11 and Co111 therefore leads to an autocatalytic conversion of Co" into Co111, the rate of which increases strongly with decreasing stirring rates. The second stage starts after 90-95% conversion of Con. The Com/Co" concentration ratio then reaches a constant value. In this stage the methyl esters are mainly converted into the corresponding hydroperoxides, while the corresponding hydroxy and keto compounds are formed as secondary products. In the third stage fragmentation products are formed and Co111 is converted into an inactive Co" complex. For the first two stages a reaction scheme is proposed which provides an adequate description of the results obtained. Conclusions are drawn for the processes taking place in drying paint films containing cobalt(II) naphthenate.