Pyruvic acid, photoreduction

Like those of biacetyl, the photoreactions of pyruvic acid in solution are entirely different from the reaction in the vapor state. Pyruvic acid is an excellent hydrogen abstractor which is photoreduced to dimethyltartaric acid (27) in isopropyl alcohol, methanol, f-butyl alcohol, chloroform, or diethyl ether.87,88 No reaction was observed in benzene, but photoreduction was... [Pg.96]

Pyruvic acid undergoes photoreduction from its triplet state, and quenching studies indicate that its triplet is several times more reactive than that of benzophenone.100... [Pg.110]

Rate constants for reaction of triplet ( , ) biacetyl with the same hydrogen donors are also included, being generally two or three orders of magnitude less. CIDNP studies on the photoreduction of pyruvic acid by propan-2-ol show the occurrence of abstraction [reaction (12)], followed by the transfer of a hydrogen atom from the polarized ketyl radical to ground-state pyruvic acid [reaction (13)],23 exactly as for the corresponding photoreduction of benzophenone. [Pg.395]

Gloss GL and Miller RJ (1978) Photoreduction and photodecarboxylation of pyruvic acid. Application of CIDNP... [Pg.319]

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