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[2+2] Photodimerization of (Z)-4-styrylpyridine through a cation–π interaction: formation of cis–cis–trans dimers

✍ Scribed by Shinji Yamada; Yuka Nojiri; Mai Sugawara

Publisher: Elsevier Science
Year: 2010
Tongue: French
Weight: 281 KB
Volume: 51
Category: Article
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2010.03.005

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✦ Synopsis

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.

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