SnCl<sub>4</sub>-Catalyzed Reaction of <i>o</i>-Benzoquinones and Aryl Acetylenes:  An Unprecedented One-Pot Synthesis of Tropone Derivatives

Highly substituted tropone derivatives were obtained as a result of SnCl<sub>4</sub>-catalyzed cycloaddition of 3-methoxy-substituted <i>o</i>-benzoquinones with aryl acetylenes and subsequent rearrangement of the adducts with concomitant decarbonylation.