An insight into the mode of action of the carcinogen benzo [a] pyrene (1) could come from the study of analogous compounds. Azulenophenalene (2), which has now been synthesized, is expected to have a considerable biological activity.

Summary: In order to examine the biological activities of the nonalternant isomers of potent carcinogen benzo [a] pyrene, benzo [4,5] Our syntheses of 2 and 3 constitute stepwise construction of the corresponding carbon skeledehydrogenation to the full conjugated systems. The sequence of the reactions, reagents, and reaction conditions used for the syntheses are shown in Chart 1 and 2.10)

The photolysis of methylenecyclobutenone in the presence of benzophenone or oxygen affords the one carbon diminished product, methyl 4,4-diphenyl-2-diphenylmethyl-2,3-butadienoate. The reaction pathway is discussed.

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xathiaadamantanen (3) angesehen werdenr21. Wir berichten jetzt iiber die Synthese von (2,4-Diisopropyl-l,3-dithietan-2,4-diy1)-bis(dithiois0butyrat) (2 a ) aus Dithioisobuttersaure und tert-Butylisocyanid (Weg B) iiber das Thioanhydrid (1 a ) und dessen Dimerisierung. (2 a ) konnte ebenfalls eine Zwischenstufe der Thiaadamantanbildung sein.O N = C = N C ) 2 RCSzH R-C-S-C-R