ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Betanin, the violet-red pigment of the beet, and its aglucone, betanidin, were converted by mild methods to several derivatives of a new structure, called neobetanidin. On the basis of elementary analyses, transformations, color changes with acid, mass-spectrographic evidence and especially nmr-spectra it was possible to assign structures II to X to these derivatives of neobetanidin. As examples of the nmr-spectra in which all signals could be identified those of II and VIII are discussed in detail and compared with model compounds. It is evident that neobetanidin incorporates a dihydroindol-and a pyridin-ring, an enamin bond, three carboxyl functions, two phenolic hydroxyl groups and a weakly basic nitrogenous polymethine system of the cyanin type.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19620450230
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