(+)-(2S,3R)-2,3-Bis(p-methoxyphenyl)valeric
acid, previously converted into (-)-(2R,3R)-2,3-bis(p-methoxyphenyl)pentane, has now been converted into
(+)-(3R,4R)-3,4-bis(p-methoxyphenyl)hexane
via (+)-(3S,4R)-3,4-bis(p-methoxyphenyl)hexan-2-one
and (-)-(4s)-3,4-bis(p-methoxypheny1)hex-2-ene.
This provides unequivocal correlation of the absolute stereochemistry of a
series of homologous diarylalkanes, and a corresponding series of diarylalkenes.