Figure 1.

1H NMR spectra of a mixture of 1 (•) and cis/trans‐azobenzene (+) in C6D6 (*) solution after different times (Δt) of UV irradiation (λ=365 nm). Initially, no formation of adduct 2 (▪) takes place, but it is complete after 5 h.

1H NMR spectra of a mixture of 1 (•) and cis/trans‐azobenzene (+) in C6D6 (*) solution after different times (Δt) of UV irradiation (λ=365 nm). Initially, no formation of adduct 2 (▪) takes place, but it is complete after 5 h.