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2004
Indan derivatives
Q 1050
Indium(III) Bromide Catalyzed Chemoselective Dimerization of Vinylarenes. —
InBr3 is found to be a mild and efficient catalyst which allows chemoselective dimeri52- 084 zation
of α-substituted vinylarenes. The reaction of vinylarenes containing electron-withdrawing substituents or an o-methoxy group leads to acyclic dimers. Starting
from vinylarenes bearing no or electron-donating substituents cyclic dimers are
obtained at room temperature. The synthesis of cyclic dimers proceeds via initial formation of acyclic dimers as shown by isolation of the derivative (III) at 0 °C. The acyclic dimers are suitable precursors of polymers. β-Substituted vinylarenes are inert under these conditions. — (PEPPE*, C.; SCHULZ LANG, E.; DE ANDRADE, F. M.; DE
CASTRO, L. B.; Synlett 2004, 10, 1723-1726; Dep. Quim., Univ. Fed. Santa Maria,
97105 Santa Maria, Brazil; Eng.) — Jannicke
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