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Synlett 1995; 1995(9): 957-958
DOI: 10.1055/s-1995-5134
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Synthesis of [2.2](3,3’)- and [2.2](3,5’)Biphenylophanes by Intermolecular [2+2] Photocycloaddition

Yosuke Nakamura, Tadahiro Mita, Jun Nishimura*
  • *Department of Chemistry, Gunma University, Tenjin-cho, Kiryu, Gunma 376, Japan
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Publication Date:
31 December 2000 (online)

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Two new [2.2]biphenylophanes, (3,3’)- and (3,5’)-ones (4a and 4b), were readily synthesized by the intermolecular [2+2] photocycloaddition of 4,4’-dimethoxy-3,3’-divinylbiphenyl (3). They exhibited quite different absorption spectra from each other, due to the difference in the dihedral angle of the biphenyl units between 4a and 4b.

biphenylophane - intermolecular [2+2] photocycloaddition - conformational rigidity