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Remarkable Suppression of [2+2] Cycloaddition during Nonresonant Two-photon Photoreaction of trans-Stilbene in the Presence of Tetramethylethylene


†Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 19-1399, Koeji, Nagamachi, Aoba-ku, Sendai 980, Japan. Fax: +81-22-217-6589; e-mail:


Abstract— Nonresonant two-photon excitation of /rans-stilbene in the presence of an excess amount of tetramethylethylene induced predominantly cis-trans isomerization; the [2+2] intermolecular cycloaddition pathway was remarkably suppressed, in contrast to the one-photon excitation under similar conditions, where the cycloaddition is known to be the major pathway.

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