Abstract
The qualitative and quantitative composition of the carotenoids of Plectania coccinea (Scop. ex Fr.) Fuck., is reported. Beside β-carotene (I) four new carotenoids, plectaniaxanthin (V), plectaniaxanthin-2′-ester (IV), plectaniaxanthin-1′,2′-diester (II) and 2′-dehydro-plectaniaxanthin-1′-ester (III), were isolated. The chemical structures of these carotenoids were established by chemical and physical methods, including direct comparison with synthetic V and VIII. The smooth hydrolysis of the tertiary esters is discussed.
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