boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.;; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; distd.; identified by 1H-, 13C- and 119Sn- spectroscopy;;
boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.; yield 44percent (erythro/threo)/trans 91/9;; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; chromd. (Al2O3, CH2Cl2).; identified by 1H-, 13C- and 119Sn- spectroscopy;;
boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.;; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; chromd. (Al2O3, CH2Cl2).; spectroscopy;;
boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.; yields: 71percent;; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; chromd. (Al2O3, CH2Cl2).; identified by spectroscopy;;
boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.; yield 75percent erythro/threo 84/16; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; chromd. (Al2O3, CH2Cl2).; solid product recrystd. from CH2Cl2/ether; identified by 1H-, 13C- and 119Sn- spectroscopy;;
boron trifluoride diethyl etherate; ammonium chloride in dichloromethane Ar; -78°C; slow addn. of BF3*Et2O; after 1 h hydrolysed with NH4Cl/H2O at room temp.; yield 75percent erythro/threo 61/34; aq. layer extd. with Et2O; combined organic layers dried over Na2SO4; evapd.; chromd. (Al2O3, CH2Cl2).; identified by 1H-, 13C- and 119Sn- spectroscopy;;
