Fig. 3

Control experiments on the radical pathway. a The control experiment using a radical scavenger. b Stepwise radical cyclopropanation. c The radical clock experiment. d The effect of para-substituent on the formation of cyclohexadiene

Control experiments on the radical pathway. a The control experiment using a radical scavenger. b Stepwise radical cyclopropanation. c The radical clock experiment. d The effect of para-substituent on the formation of cyclohexadiene