Figure 3.

Irradiation of ProtPE (9.2 mmol L⁻¹, 1 equiv), PC (1 mol %), bicyclo[2.2.1]hept‐2‐ene (5 equiv) and NEM (1.3 equiv) in 500 μL deuterated DCM with (a) only λ₂=350 nm and (b) λ₁=415 nm and λ₂ simultaneously. Conversions determined via ¹H‐NMR spectroscopy from the aromatic triplets for ProtPE and o‐MBA and the distinct doublet of the hydroxy group's α‐carbon for the D–A adduct. Error bars were determined by the standard deviation of repeated NMR measurements and propagating the relative error to all the data points. Solid lines are a guide for the eye only.