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The magnetic circular dichroism (MCU) spectra of some 3‐arylfervenulins and 3‐aryltoxo‐flavins were measured. From the dependence of the Faraday B values of 3‐arylfervenulins and 3‐aryltoxoflavins on the Hammet σpara values, it is concluded that the substituent effects on the Faraday B values of 3‐aryltoxoflavins are reverse to the substituent effects on the Faraday B values of 3‐arylfervenulins and the reverse property of 3‐aryltoxoflavins concerning the substituent effects rises from the contribution of the 1,5‐dipolar structure of 3‐aryltoxoflavins.

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