Journal of Organic Chemistry p. 3080 - 3082 (1991)
Update date:2022-09-26
Topics:
Dahn, Hans
Rotzler, Gerhard
During the acid hydrolysis of (hydrated) 4-aryl-2,3-diketobutyramide 2 (aryl = phenyl, o-chlorophenyl, p-methoxyphenyl), 3-aryllactic acid (5) is formed by rapid decarboxylation of the intermediate diketo acid (3).In the decarboxylation step, a further unstable intermediate is formed.The latter manifests itself by reducing 1 mol of added iodine during the hydrolysis-decarboxylation reaction, thereby forming 3-arylpyruvic acid (6), isolated instead of 5.Thus, the oxidation of the unstable intermediate by iodine is more rapid than its ketonization.It is formulated as an 1,1,2-enetriol (4), more probably than an α-hydroxyketone.
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