Synthesis of Tricyclo[184.108.40.206^<2,4>]hexasilane and Its Photochemical Isomerization to Tricyclo[220.127.116.11^<2,5>]hexasilane
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The first <I>anti</I>-tricyclo[18.104.22.168<SUP>2,4</SUP>]hexasilane <B>1</B> was synthesized as pale yellow crystals. Irradiation (λ > 370 nm) of <B>1</B> gave its skeletal isomer, tricyclo[22.214.171.124<SUP>2,5</SUP>]hexasilane <B>2</B>, in 80% yield. The photochemical [<SUB>σ</SUB>2<SUB>s</SUB> + <SUB>σ</SUB>2<SUB>s</SUB>] cycloreversion of <B>1</B> followed by the thermal [<SUB>π</SUB>2<SUB>s</SUB> + <SUB>π</SUB>2<SUB>a</SUB>] cycloaddition to <B>2</B> would explain the overall isomerization.
- Chemistry Letters
Chemistry Letters 36(3), 368-369, 2007-03-05
The Chemical Society of Japan