Process for preparing alkyl esters of methyltartronic acid

Details Process for preparing alkyl esters of methyltartronic acid Process for preparing alkyl esters of methyltartronic acid

C - Chemistry, Metallurgy

07

C

260/486.2

C07C 69/675 (2006.01) C07C 51/235 (2006.01) C07C 51/27 (2006.01) C07C 51/285 (2006.01)

Patent

CA 1253169

ABSTRACT OF THE DISCLOSURE There is described a process for preparing alkyl esters of methyltartronic acid by hydroxylation of methacrylic acid to alpha-methylglyceric acid with H2O2, in an aqueous medium, in the presence of H2WO4 and optionally of H3PO4 or H3AsO4 or alkaline salts thereof as catalysts, at pH < 2 and at temperatures of from 50° to 100°C, by subsequent oxidation of alpha-methylglyceric acid to methyltartronic acid with HNO3 in excess or with O2, in an aqueous-alkaline medium, in the presence of Pd or Pt or oxides thereof carried on carbon as catalysts, at temperatures of 60- 100°C, and final esterification of methyltartronic acid with alcohols C1-C4.

484261

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