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Triplet sensitized isomerization of a series of β-alkylstyrenes has been investigated with the use of various sensitizers. Among the olefins employed β-t-butyl- and β-t-pentylstyrene were found to give remarkably high ratios of the cis-isomers (>80%) at the photostationary state. This fact is reasonably attributed to lower rate constants for energy transfer from the triplet sensitizers to the cis-isomers than to the trans-isomers.
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Arai et al. (1982) studied this question.
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