Estudo de reatividade na redução eletrolítica de alguns α-cetoesteres em metanol, com eletrodos de platina / Study of the reactivity of the electrolytic reduction of some α-ketoesters in methanol, with platinum electrodes

AUTOR(ES)

Vera Lucia Pardini

DATA DE PUBLICAÇÃO

1974

RESUMO

The present work describes the syntheses of some aliphatic and aromatic α-hydroxy - and α-keto-methyl esters and reports the electrolyses of the latter, in methanol, at a platinum cathode Some simple electrolytic experiments, varying the experimental conditions as well as those in which the transformations occurring during the electrolyses were followed by gas chromatography, are described. The reactivities towards cathodic reduction are reported and the following order of the relative rate for the reduction is suggested: α-oxovalerate > α-oxobutyrate > pyruvate>phenylglyoxylate > 4-chlorophenylglyoxylate > 4-methoxycarbonylphenylglyoxylate .No reduction is found to occur with 4-methoxyphenylglyoxylate 4-nitrophenylglyoxylate or 4-oxopymelate .An explanation for these differences in reactivities is suggested on the basis of electronic effects, steric inhibition of coplanarity, and hemiacetal formation

ASSUNTO(S)

α-cetoesteres α-ketoesters electrodes electrolytic reduction eletrochemistry (syntheses) eletrodo eletroquímica (síntese) metanol methanol platina platinum redução eletrolítica

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