n-butyllithium in tetrahydrofuran T=-78°C; 0.5 h;

in tetrahydrofuran under argon; tin-compound in THF cooled to -78 °C; LiBu was added; stirring 15 min; quenched with benzaldehyde; stirring 30 min at -78 °C; addn. of NH4Cl-soln.; warming to room temp.; extn. (ether); organic layer dried (Na2SO4), filtered, concd. (vacuo); chromd. (silica gel; ethyl acetate/petroleum ether 15:85); NMR; IR;;

n-butyllithium in tetrahydrofuran T=-78°C; 0.5 h;

in tetrahydrofuran under argon; tin-compound in THF cooled to -78 °C; LiBu was added; stirring 15 min; quenched with benzaldehyde; stirring 30 min at -78 °C; addn. of NH4Cl-soln.; warming to room temp.; extn. (ether); organic layer dried (Na2SO4), filtered, concd. (vacuo); chromd. (silica gel; ethyl acetate/petroleum ether 15:85); NMR; IR;;