in diethyl ether byproducts: (p-CF3C6H4)CO(C2H5); N2-atmosphere; dropwise addn. of 2 equiv. of Li-compd. to Fe-complex soln. at -65°C, stirring for 5 h, evapn. (-50 to -40°C, vac.), addn. of Et3OBF4, dissoln. in H2O at 0°C, layering with petroleum ether, addn. of Et3OBF4; extn. into petroleum ether, drying (Na2SO4), solvent removal (vac.), chromy. (Al2O3, petroleum ether, then petroleum ether/Et2O=20:1), solvent removal (vac.), recrystn. (petroleum ether, -80°C); elem. anal.;

in diethyl ether N2-atmosphere; dropwise addn. of 2 equiv. of Li-compd. to Fe-complex soln. at -65°C, stirring for 4.5 h, evapn. (-50 to -40°C, vac.), addn. of Et3OBF4, dissoln. in H2O at 0°C, layering with petroleum ether, addn. of Et3OBF4; extn. into petroleum ether, drying (Na2SO4), solvent removal (vac.), chromy. (Al2O3, -25°C, petroleum ether, then petroleum ether/Et2O=10:1), solvent removal (vac.), recrystn. (petroleum ether/CH2Cl2, -80°C); elem. anal.;