Abstract

Kondensation entsprechender Dilithioverbindungen (I) und Chinone (II) geben die Diole (III) mit verschiedenem Grad von ace‐Verbrückungen; Oxidation von (III) führt zu den Diketonen (IV), die bei der Wolff‐Kishner‐Reduktion die Produkte (V) und /oder (VI) liefern.

Photoreactions of trans-10b,10c-Dimethyl-10b,10c-dihydropyrenes.-Irradiation of a deoxygenated solution of (I) leads to the exclusive formation of (II). In the presence of oxygen, successive photoconversion to (III) occurs. In the dark, the epidioxy products revert to give initially (II) and subsequently the dihydropyrene (I). Various mixtures of the potassium mono-, di-, tri, and tetrasulfonate salts of (Ia), obtained by SO3 sulfonation, also photoisomerize to the corresponding sulfonate derivatives of the primary photoproduct. For a quantitative study the kinetics of the photoisomerizations are investigated. -(CERFONTAIN, H.; KOEBERG-TELDER, A.; BAKKER, B. H.; MITCHELL, R. H.; TASHIRO, M.; Liebigs Ann.

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