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  • Title: Synthesis of silafluorenes by iridium-catalyzed [2 + 2 + 2] cycloaddition of silicon-bridged diynes with alkynes.
    Author: Matsuda T, Kadowaki S, Goya T, Murakami M.
    Journal: Org Lett; 2007 Jan 04; 9(1):133-6. PubMed ID: 17192103.
    Abstract:
    [reaction: see text] Silicon-bridged 1,6-diynes underwent [2 + 2 + 2] cycloaddition with alkynes in the presence of an iridium(I)-phosphine catalyst to afford densely substituted silafluorene derivatives. Extended silafluorene skeletons were constructed by the [2 + 2 + 2] cycloaddition of tetraynes.
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