10.1002/jps.2600621136.abs trans‐8‐(3,4,5‐Trimethoxystyryl)caffeine, dissolved in methanol or chloroform, rapidly isomerizes to an equilibrium mixture of trans‐cis‐isomers in the presence of visible light. Geometric isomerization was established by catalytic hydrogenation of both reactant and product to yield 8‐(3,4,5‐trimethoxyphenethyl)caffeine.
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