Stabilization of dicarbonate diesters with protonic acids

A process for stabilization of diesters of dicarbonic acid against chemical and thermal breakdown reactions, comprising:

• admixing said diesters of dicarbonic acid with at least one protonic acid, wherein the protonic acid is selected from the group of an inorganic acid and derivatives thereof and an organic carboxylic acid, and
• further wherein said organic carboxylic acid is selected from the group consisting of saturated and monounsaturated or polyunsaturated aliphatic monocarboxylic acids, saturated and monounsaturated or polyunsaturated aliphatic dicarboxylic and polycarboxylic acids and derivatives thereof, hydroxamic acids, hydroxycarboxylic acids, amino acids, and keto acids, and
• wherein the diesters of dicarbonic acid is a compound of the general formula (I)
• where
• R1 and R2 independently of one another are straight-chain or branched C1-C8-alkyl, cycloalkyl, C2-C8-alkenyl, C2-C8-alkynyl or benzyl, each of which is optionally monosubstituted to polysubstituted, identically or differently by halogen;
• nitro;
• cyano;
• C1-C6-alkoxy;
• dialkylamino;
• or are phenyl which is optionally monosubstituted to polysubstituted, identically or differently by halogen;
• nitro;
• cyano;
• alkyl;
• haloalkyl;
• alkoxy;
• haloalkoxy;
• acyl;
• acyloxy;
• alkoxycarbonyl;
• carboxyl.