Abstract
On photosensitization by tris(2,2′-bipyridine)chromium(III), trans-β-styrylnaphthalene undergoes geometrical isomerization and (in the presence of dioxygen) oxidation to benzaldehyde and naphthaldehyde. Whereas oxidation seems to be due to attack by singlet oxygen, isomerization originates from a cationic radical of the olefin, formed in an electron transfer to be excited complex. The reactivity of such a radical is compared with those of triplet excited states and anionic radicals of stilbene derivatives.
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