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The C 2 -symmetric bis(1,6-enynes) threo-1,10-diphenyl-5,6-divinyl-1,9-decadiyne and threo-9,10-divinyl-5,13-octadecadiyne undergo the intramolecular Pauson-Khand reaction regio- and stereoselectively to give C 2 -symmetric bis(enones) with two bicyclo[3.3.0]octyl moieties joined at the C6 position. Experiments aimed at converting the bis(enones) into chiral, diastereopure ansa-bridged...
Arylmethyl alkyl ethers 1a-1l were metallated with n-BuLi or sec-BuLi in THF at different temperatures, affording α-alkoxy-substituted arylmethyllithium derivatives. At low temperature, the organometallics derived from methyl and isopropyl ethers are sufficiently stable to react with added electrophiles affording the expected products 4aa-4jb. On the contrary, under similar conditions, lithium derivatives...
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