Fig. 6: Radical clock experiments.
From: Alkyne–Alkene [2 + 2] cycloaddition based on visible light photocatalysis
Racemates for all products. a Intermolecular reaction between cyclopropyl alkyne 1l and 2a. b Intermolecular reaction between 1a and cyclopropyl alkene 2y. c Individual reactivity of 2y and 1l under the standard conditions.
