Chemiexcitation of Naphthacenequinone Derivative via the Thermal Cycloreversion of the Corresponding hemi-Dewar-naphthacenequinone
7,8,9-Tri-t-butyl-1,4-Dewar-5,12-naphthacenequinone (1) was synthesized. Upon thermolysis of 1 the formation of the detectable amount of naphthacenequinovalene (3) was observed. Singlet excited state of 7,8,9-tri-t-butyl-5,12-naphthacenequinone produced via the thermal cycloreversion of 1 is responsible for the formation of 3.