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Carboxylic acids 1 -pyrroline-2-, 4-hydroxy-5-

Aspartic acid A -Pyrroline-S-hydroxy-S-carboxylic acid... [Pg.87]

Oxidative decarboxylation of pyrrole-2-carboxylic acids Reaction of pyrrolc-2-carboxylic acids such as 1 and 2 with singlet oxygen in i-PrOH or CH3CN and water (3 1) results in 5-hydroxy-3-pyrrolin-2-ones in high yield. [Pg.252]

Knowledge of hydroxyproline oxidation is even more advanced than that for proline. Formation of a carbonyl compound on enzymic oxidation of L-hydroxyproline had been observed by Taggart and Krakaur 173), and it was postulated to be y-hydroxyglutamic-y-semialdehyde in equilibrium with A -pyrroline-3-hydroxy-5-carboxylic acid. [Pg.120]

The mechanism of acid degradation and humin formation is undoubtedly complex. A A -pyrroline derivative was proposed (Gottschalk, 1960) as an initial cyclization product, and this was later substantiated by identification of 4-hydroxy-5-(l,2,3,4,-tetrahydroxybutyl)-A -pyrroline-2-carboxylic acid (XXVI) (Gielen, 1967a). This compound is... [Pg.24]

See other pages where Carboxylic acids 1 -pyrroline-2-, 4-hydroxy-5- is mentioned: [Pg.141]    [Pg.392]    [Pg.183]    [Pg.151]    [Pg.392]    [Pg.471]    [Pg.95]    [Pg.215]    [Pg.87]    [Pg.502]    [Pg.502]    [Pg.169]   
See also in sourсe #XX -- [ Pg.40 , Pg.141 ]



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Pyrroline

Pyrroline-5-carboxylate

Pyrroline-5-carboxylic acid

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