ethylmagnesium bromide in tetrahydrofuran T=20°C; 3 h; variation of reagent; Product distribution;

magnesium; methyl iodide 1.) THF, 40-45 deg C, 1.5 h, 2.) 10 deg C, 20 deg C, 3 h, 40 deg C, 0.5 h; Yield given. Multistep reaction. Yields of byproduct given;

ethylmagnesium bromide 1.) THF, 40-45 deg C, 1.5 h, 2.) 10 deg C, 20 deg C, 3 h, 40 deg C, 0.5 h; Yield given. Multistep reaction. Yields of byproduct given;