trans-2-Cycloocten-1-one and trans-2-cyclohepten-1-one, which are supposed to be formed by the ultra-violet irradiation of cis-2-cycloocten-1-one and cis-2-cyclohepten-1-one, give Diels-Alder addition products with cyclopentadiene and isoprene.
Bei der UV‐Bestrahlung von cis‐Cycloocten‐(2)‐on‐(l) bzw. cis‐Cyclohepten‐(2)‐on‐(1) in Gegenwart von Cyclopentadien bzw. Isopren in Hexanlösung bilden sich zunächst die trans‐Isomeren (II), die die Diene unter Bildung der Derivate (I) bzw. (III) addieren.
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