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The benzene-photosensitized cis-trans isomerization of butene-2 has been investigated in the gas phase. The results have been discussed on the basis of a mechanism involving triplet energy transfer from benzene to butene-2. The quantum yield measurements indicate that the reaction occurs at a very high efficiency. The triplet-benzene quenching efficiency of butene-2 has been shown to be considerably greater than that of the ground-state benzene. The photostationary cis-to-trans ratio has been about unity, unlike the value obtained by Cundall et al. A mechanism which may explain the dependence of the ratio on the pressure and on the energy of the sensitizer has been suggested.
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Tanaka et al. (1965) studied this question.
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