[2+2] Photodimerization of (Z)-4-styrylp
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Shinji Yamada; Yuka Nojiri; Mai Sugawara
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Article
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2010
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Elsevier Science
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French
β 281 KB
The cis-cis-trans cyclobutanes are prepared by photodimerization of (Z)-4-styrylpyridine. A catalytic amount of HCl plays a key role in enhancing the [2+2] photocyclization reactions between (Z)-and (E)-4-styrylpyridines to give r-cct and r-ctc cyclobutane dimers through a cation-p interaction.