Chiral Tethered Arenes

Intramolecular displacement of a fluoride in an electron-deficient arene by a phenohc oxygen is a reliable method for the construction of macrocychc diaryl ethers (66 67) and a useful alternative to the 

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The methyl o-toluate complex [RuCl2(/i -l,2-MeCgH4C02Me)]2 (1) employed in earlier studies on planar chiral areneruthenium complexes proved to be a suitably labile precursor to the tethered arene complexes. It reacts with the donors mentioned above in a 1 2 mol ratio in dichloromethane at room temperature to give quantitatively the corresponding P-bonded adducts [RuCl2( / -... 

Not surprisingly, donor functionalization has been extensively applied to tailor cyclopentadienyl ligands (Fig. 10). In addition to the attachment of one pendant donor arm [160,201], functionalization via donor-linked bis(cyclopentadi-enyl) ligands [202], including donor-tethered silicon bridges [203], and donor functionalized chiral side chains are found [204]. Only a few examples feature soft donor functionalities such as phosphines [205] and arenes [206]. 

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