Study of axially dissymmetric biaryls has recently been revived.Most of thework
however
were focused in derivatives of 1
1′-binaphthyl in terms oftheir syntheses and application to chiral recognition and various asymmetricsyntheses.We have been interested in finding synthesis and stereochemistryof higher analog of biaryls.In this article
we demonstrate a novel syntheticapproach to both enantiomers of 10
10′-dihydroxy-9
9′-biphenanthryl[(-)- and(+)-6].An attempt of transformation of 9-methoxy phenanthrene (3) with n-butyl-lithium and TMEDA in ether at-78℃ or room temperature to its lithium deriva-tive (4) has yet been successful (Scheme 1).We have then explored the suitablereagent for oxidative coupling of 9-phenanthrol (8) to (±) -6.Despite theusefulness in synthesis of bis-2-naphthol(10)