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Degradative and spectroscopical evidence, as well as biogenetic considerations led to the conclusion that thelephoric acid is 2,3,8,9-tctrahydroxybenzobis[l,2-b,4,5-b-6,12quinone(V1). This view was confirmed by synthesis, involving condensation of chloranil with two molecules of 3+dimethoxyphenol and subsequent demethylation. THELEPHORIC acid was investigated by Kiigl er al.' and on the basis of degradation reactions formula I was proposed. Doubt concerning this formula was cast by Millward and Whiting,2 who synthesized 1,2'-phenanthryl-1,3\_butadiene(II), which Kijgl et al.' claimed to have obtained from thelephoric acid acetate and record properties very different from those reported by Kogl et a1.l As no authentic sample was available for direct comparison, the possibility of polymorphism and/ or stereoisomerism could not be ignored, but the necessity of a more thorough study of thelephoric acid was obvious. ,.,o.,/,/cn==~-c+,=ci'-cooi'i &\_/%=cli CH=ct+,

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Author

J. Gripenberg

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0040-4020)

Published

1960

Language

EN

Field

Chemistry (Physical Sciences)