Präbetanin, ein Schwefelsäure‐halbester des Betanins. Ein Beitrag zur Kenntnis der Betacyane

Abstract

Abstract Prebetanin, a minor companion of betanin in the red beet, was isolated and found to be the 6′‐sulfuric acid half‐ester of betanin. The arguments are based on elemental analyses, partial hydrolysis and methanolysis, and on comparison of the NMR‐spectra of prebetanin and betanin, and of their derivatives.