Stereoselective Syntheses of Alkenyl-Substituted 1,3-Dioxolanes or 4,7-Dihydro-1,3-dioxepins or an (E)-α,β-Unsaturated Aldehyde from (Z)-2-Butane-1,4-diols

Article abstract of DOI:10.1021/jo00211a053

Treatment of (Z)-2-butene-1,4-diols with boron trifluoride etherate in acetone solvent affords stereodefined alkenyl-substituted 1,3-dioxolanes or 4,7-dihydro-1,3-dioxepins or an (E)-α,β-unsaturated aldehyde, depending on the reaction temperature and time