Figure 3

The UV absorption spectral changes caused by irradication (λ>340 nm) of 1c (2.0 × 10^–4 mol dm^–3) in nitrogen-saturated 1,2-dimethoxyethane at room temperature. The irradiation times were 0 (curve a), 10 s (curve b), 30 s (curve c) and 60 s (curve d).