M5 4WT4-(Substituted amino) -6-chloropyrimidines bearing a mesomeric eleciron-withdrawing substituent such as NO, .CN, CHO, or Ac at position 5 are cleaved by dilute sodium hydroxide, often a t room temperature, to yield tetrasubstituted olefins. Unlike acid-catalysed attacks on similar pyrimidines, the course of these basic reactions was not strongly influenced by steric interference between the 4( 6)and 5-substituents.
benzo [1,2-b ; 4,5-b']dipyran (5) is sensitive to acids, which partly convert it into a cation radical (6) that can be isolated as the crystalline hexachloroantimonate by treating the dipyran with antimony(v) chloride.
Das Benzochinon (I) reagiert mit dem Carbanion (III) (in situ aus dem Benzimidazol (II)] in schwach basischem Medium zum Fluorenderivat (IV) und zum Dichinon (V).
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