Diels‐Alder‐Reaktionen des Cyclobuta[1,2:3,4]dicycloheptatetraens, eines [4]Radialens

Diels-Alder Reactions of Cyclobuta[1,2:3,4]dicycloheptatetraene, a [4]Radialene [4]Radialene 1 selectively adds active dienophiles like tetracyanoethylene, dimethyl acetylenedicarboxylate, 4-phenyl-1,2,4-triazoline-3,5-dione, N-phenylmaleimide, maleic anhydride, and benzyne at C-1 and C-10 to give Diels-Alder adducts of type 6.