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Zur Struktur des Betanidins. 6. (vorläufige) Mitteilung. Über die Konstitution des Randenfarbstoffes Betanin

✍ Scribed by H. Wyler; T. J. Mabry; Andre S. Dreiding

Publisher
John Wiley and Sons
Year
1963
Tongue
German
Weight
268 KB
Volume
46
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

A choice between structures I and III for betanidin is now possible in favour of I on the basis of the formation of a well‐characterized di‐O‐acetylderivative (II). The instability of betanidin and its ready transformation into other products at elevated pH's are shown to be due to its sensitivity to atmospheric oxygen. Betanidin and Isobetanidin have the same (namely S) configuration at C‐2 and may differ only in the configuration at C‐15. A possible biogenetic path is proposed.

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