EXCLUSIVE PRODUCTION OF A CYCLOADDUCT FROM SELECTIVE EXCITATION OF THE CHARGE-TRANSFER COMPLEX BETWEEN ACENAPHTHYLENE AND TETRACYANOETHYLENE IN THE CRYSTALLINE STATE IN CONTRAST TO FAILURE OF REACTION IN SOLUTION

Selective excitation of the charge-transfer complex between acenaphthy lene and tetracyanoethylene in the crystalline state exclusively affor ds a 1:1 [2 + 2] cycloadduct, in contrast to the excitation in solutio n, which gives no product.