- Known and New Types of Reactions in the Photoreaction of Stilbenes with Cyclic Imines
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The photoreactions of stilbene and 1,4-diphenyl-1,3-butadiene with caffeine and of stilbene with benzothiazole, 1-methylimidazole and 2-(methylthio)benzothiazole have been investigated with respect to know (- , -cycloaddition , inserting -addition ), mechanistically new (uncatalyzed, substitutive -addition ) and principally new reaction types (substitutive -addition with substituent migration and cleavage of a double bond , substitutive -addition with cleavage of a double bond , intermolecular exchange of vinyl substituents ).The products are isolated and characterized analytically, spectroscopically (UV, 1H, 13C NMR) and by chemical transformations .The new reaction types are without precedence.They are formulated to occur via 1,4-diradicals.
- Kaupp, Gerd,Grueter, Heinz-Willi
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p. 2844 - 2858
(2007/10/02)
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