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The photosensitized isomerization of provitamin D 3 was studied in THF solutions of styrene-2-vinylnaphthalene copolymers, poly(2-vinylnaphthalene), poly(2-isopropenylnaphthalene) and poly(acenaphthalene). The effect of efficiency of excimer formation and energy migration on the quantum efficiency of previtamin formation was demonstrated.
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