Abstract
Within a few minutes at room temperature, intramolecular [5+2] cycloaddition reactions of vinylcyclopropanes and tethered alkenes or alkynes reach completion when arene-ligated rhodium(I) complexes are used as catalysts (see scheme). In particular, naphthalene complex 1 was found to be an exceptionally effective and, in cases where comparisons have been made, preferred catalyst.
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