1-(Methylthio) and 1-(phenylthio)vinyllithiums were prepared by the treatment of the corresponding 2-methoxyethyl sulfides with twice molar amounts of butyllithium in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA). β-Alkylthio-β,γ-unsaturated alcohols were obtained in good yields by the reaction of the lithium salts with aldehydes.
REGIO AND STEREOSELECTIVE COUPLING REACTION OF GRIGNARD REAGENTS WITH β-PHENYLTHIO β,γ-UNSATURATED ALCOHOLS USING TETRACHLOROSILANE. A NEW METHOD FOR THE PREPARATION OF (<i>Z</i>)-ALKENYL SULFIDES
The coupling reaction of (E)-β-phenylthio β,γ-unsaturated alcohols with Grignardreagents using tetrachlorosilane as a condensation reagent gave (Z)-SN2′ products exclusively, whereas the reaction of the corresponding Z-isomers proceeded by SN2 attack with retention of double bond geometry.