Chemistry of quinones. Part V. Structure of cladofulvin, a bianthraquinone from Cladosporium fulvum cooke
Abstract
Chemical and spectroscopic evidence indicates that the natural quinone cladofulvin is the unsymmetrical 5,7′-didehydro-dimer of 1,2,8-trihydroxy-6-methylanthraquinone (nataloe-emodin), 1′,4,5,6,7′,8′-hexahydroxy-2,3′-dimethyl-1,2′-bianthracene-9,9′,10,10′-tetrone (II; R1= R2= H).