Abstract
The radiation-induced carboxylation process of aliphatic and aromatic hydroxy-compounds in aqueous CO 2-solutions was thoroughly studied in its dependence on the radiation dose and the pH. As a model substance a 0·1 m solution of methyl alcohol as well as solutions of phenol of varying concentrations (10 −4−10 −1m) were used. The products of carboxylation formed were glycolic acid and p-as well as o-hydroxybenzoic acid (salicylic acid) respectively. The yield of glycolic acid under optimal conditions (pH = 4−6) was G(glycolic acid) = 2·1, whereas the values of G(salicylic acid) were found to be 0·5 at the best. Furthermore α-hydroxyvaleric acid was obtained as a carboxylation product from n-butanol. To explain the radiation-induced carboxylation process a reaction mechanism was proposed.
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