Natural and synthetic pyrrol-2-ylpolyenes

Abstract

By structural studies, and comparisons with synthetic models, the two main pigments of Wallemia sebi have been identified as 2,10-dimethyl-5-hydroxy-11-(pyrrol-2-yl)undeca-4,6,8,10-tetraen-3-one (11) and 2,2-dimethyl-5-[5-methyl-6-(pyrrol-2-yl)hexa-1,3,5-trienyl]furan-3(2H)-one (12). Geometrical isomers and chloro-derivatives of these pigments were also observed.