Fig. 4 | Nature Communications

Fig. 4

From: Controlling thermal reactivity with different colors of light

Fig. 4

UV-induced photoenol reaction of o-methylbenzophenone. Photoisomerization of o-methylbenzophenone 3 generates diene 4 that is susceptible toward [4+2]-cycloaddition reactions with electron poor enes such as N-maleimides. Reaction of 4 with 4-n-butyl-TAD 1 leads to a mixture of 5a and 5b, with both products shown to stand in equilibrium with one another via the labile hemiaminal type bond (highlighted in red), as was evidenced by the formation of cyclic adduct 6 upon reduction

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