Abstract
AbstractA 3‐azabicyclo[3.2.0]hepta‐1,4‐diene with no substituent in the cyclobutene moiety has been prepared for the first time; it undergoes extremely facile electrophilic attack at the β‐position to give the ring‐opened product, probably by a retro‐Friedel−Crafts process. The title compound also undergoes a novel reaction with dimethyl acetylenedicarboxylate to afford the azepine. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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