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Revolutionary Rh-oad: A rhodium/diene-catalyzed addition of sodium tetraarylborates to alkyne-tethered 2-cycloalken-1-ones has been developed for the synthesis of spirocarbocycles. The tetraarylborates catalytically form two new carbon–carbon bonds. A chiral diene ligand also asymmetrically creates quaternary spirocarbon stereocenters with high enantiomeric purity.
Shintani et al. (Thu,) studied this question.