Antioxidant action of organic sulphites—I. Esters of sulphurous acid as secondary antioxidants

Add time:08/03/2019    Source:sciencedirect.com

The efficiency of esters of sulphurous acid as secondary antioxidants has been studied. Several aliphatic as well as aromatic open-chain and cyclic sulphites were synthesized and reacted with tert-butyl-, cumene- and α-tetralin hydroperoxides. All sulphites investigated decompose hydroperoxides in a nonradical way. This reaction proceeds in two steps: in a slow redox reaction and a rapid catalytic decomposition of the hydroperoxides. The open-chain alkyl sulphites and the cyclic sulphite of 2,2′-thiobis-(6-tert-butyl-4-methylphenol) show especially high efficiency. In comparison with trivalent phosphorus compounds, esters of sulphurous acid react more slowly in the stoichiometric reaction step, but are also able to decompose hydroperoxides catalytically. Besides these sulphuric acid esters, SO2, SO3, and H2SO4 also take part as catalysts in the reaction. Finally, the rate constants of the reductive and catalytic step of the hydroperoxide decomposition were determined.

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