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New axially chiral ligands and their allyl esters have been designed and synthesized. The combination of these ligands with [CpRu(CH3CN)3]PF6 has realized highly efficient intramolecular dehydrative cylization of ω-hydroxy allyl alcohols, to give α-alkenyl-substituted cyclic ethers with up to greater than 99:1 enantiomeric ratio without activation of the allylic moieties (see scheme; Cp=cyclopentadienyl, naph=naphthyl, py=pyridine).
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Tanaka et al. (2009) studied this question.
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