Fig. 7: Mulliken spin densities (T1) and triplet-singlet energy gaps of selected substrates.
From: Alkyne–Alkene [2 + 2] cycloaddition based on visible light photocatalysis
a Reactions were conducted with the standard condition using di(p-tolyl)acetylene 1a (0.1 mmol). a Spin densities and surfaces of 1a and 2a; Spin densities of cyclopropyl derivatives 1l and 2y. b Correlation of spin densities and reaction efficiencies of N-substituted maleimides.
