Photochemistry of Diarylsubstituted 2H‐Tetrazoles. VI. Quantumyields of the Photolysis of Diarylsubstituted 2H‐TetrazolesThe photoexcitation of diarylsubstituted 2H‐tetrazoles in ethanol in the presence of methylmethacrylat (MMA) yields quantitatively 1,3‐diaryl‐Δ2‐pyrazolines. The photoreactions investigated are spectroscopically uniform. The influence of the substituents on the quantum yields of the photolysis of 2H‐tetrazoles (1a—1x) is discussed.

Photochemistry of Substituted Cycloheptatrienes. III. Sigmatropic Hydrogen Shift in Arene Cycloheptatrienes The monochromatic photoexcitation of substituted phenylcycloheptatrienes 1–8 exclusively gives rise to 1, 7‐hydrogen shift. The sequences of photoreactions of the isomeric compounds are discussed. The qualities and quantities of the hydrogen shifts of dimethylamino‐phenyl‐ycloheptatrienes 4–7 depend on the wavelengths of photoexcitations.

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