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Bicycle production: The low-valent rhenium complex ReCl (CO) 5 catalyzes a tandem intramolecular cyclization reaction of ω-acetylenic dienol silyl ethers. The alkyne undergoes a geminal carbofunctionalization in the presence of 0. 5–3. 0 mol % ReCl (CO) 5 under photoirradiation to give bicyclic enol silyl ethers in high yields (see scheme, TIPS=triisopropylsilyl). Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂002/2005/z461559ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Kusama et al. (Wed,) studied this question.