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2-Carboxy-5-hydroxy-4-pyrone

Die Reduzierbarkeit der 2H-Pyrone hangt stark von ihrer Struktur ab. Wahrend 6-Carboxy-2H-pyron z. B. in der Kalte mit Lithiumalanat selektiv zu 2-Hydroxy-6-carb-oxy-2H-pyran (100° d. Th.) reduziert wird4, erhalt man i. a. aus 2H-Pyronen unge-sattigte Carbonsauren (s.S. 444). [Pg.227]

Carboxy-, 5-dimethyl nitrobenzene, AP11 Carboxyferrocene, ATl6 2-Carboxy-3-hydroxy- -pyrone,... [Pg.623]

Pyrimidine 5-(2-Carboxy-ethenyl)-4-hydroxy- E9b/1, 48 (5-COOR — 2H-pyron + Formamidine) Toluol... [Pg.359]

A different approach can be found in the reaction of diketene 44 with Meldrum acid (45). Treatment of the resulting derivative 46 with TsOH in benzene forms 3-carboxy-4-hydroxy-6-methyl-2-pyrone (47) (84SC265). [Pg.15]

See other pages where 2-Carboxy-5-hydroxy-4-pyrone is mentioned: [Pg.664]    [Pg.667]    [Pg.455]    [Pg.178]    [Pg.178]    [Pg.623]    [Pg.664]    [Pg.664]    [Pg.667]    [Pg.667]    [Pg.468]   
See also in sourсe #XX -- [ Pg.256 ]



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2-Pyrones 5-carboxy

4-Hydroxy-2-pyrones

5-Carboxy-3-hydroxy

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