Non-resonant two-photon excitation induced dramatical change in the photoreaction pathways of stilbenes. Typically, irradiation of cis-stilbene with 532 nm laser pulses caused only isomerization to trans-stilbene in hexane at room temperature; the cyclization to dihydrophenanthrene was completely suppressed.
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Miyazawa et al. (1995) studied this question.
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