Fig. 2 | Nature Communications

Fig. 2

From: Controlling thermal reactivity with different colors of light

Fig. 2

Proof of photodeactivation. a Trapping experiment consisting of the sequential addition of cyclopentadiene (1.2 eq.) and N-ethylmaleimide (1.4 eq.) to a solution of 1 (0.3 M in CDCl3) either kept in the dark or, b continuously irradiated with visible light (544 nm, 4 mW cm−2). c Whereas the 1H-NMR spectrum of the dark reaction (spectrum I) shows the complete trapping of 1 with cyclopentadiene, no such TAD adduct is observed when the visible light is switched on (II, dashed red line), thereby demonstrating the ability to photodeactivate 1 and thus to switch off the thermal TAD-based Diels–Alder reaction channel

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