Mv. Barnabas et Ad. Trifunac, RADICAL CATIONS OF QUADRICYCLANE AND NORBORNADIENE IN POLAR ZSM-5 MATRICES - THERMAL RETRO-DIELS-ALDER REACTION, Journal of the Chemical Society, Chemical Communications, (10), 1993, pp. 813-814
The radical cation of norbornadiene or quadricyclane (Q) and of norbor
nadiene (NBD) produced by gamma-radiolysis in polar ZSM-5 undergo a re
verse Diels-Alder reaction, which is a thermally forbidden, photochemi
cally allowed process, to cyclopentadiene radical cation.