Fig. 1: Synthesis of 4-membered ring carbocycles.
From: Alkyne–Alkene [2 + 2] cycloaddition based on visible light photocatalysis
a Previous works for the synthesis of cyclobutenes, cyclobutanes, and 1,3-dienes. b This work for the synthesis of cyclobutenes and 1,3-dienes via visible light EnT photocatalysis.
