A highly active, cationic, phosphane-ligand-free rhodium species is formed in an aqueous anionic micellar system (see scheme). The combination of [{RhCl(nbd)}2]–sodium dodecyl sulfate acts as an effective catalyst for the intramolecular [4+2] annulation of 2,4-dienyl propargyl ethers in water (nbd=norbornadiene).
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Motoda et al. (2004) studied this question.
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