lithium aluminium tetrahydride in diethyl ether 20 h; Heating; Yield given. Yields of byproduct given;

n-butyllithium; N,N-dimethylchloromethyleniminium chloride; copper(l) iodide 1.) THF, -90 - -60 deg C, 1 h; 2.) dichloromethane, THF, -60 -> -30 deg C in 2 h; 3.) dichloromethane, THF, -30 deg C, 2 h; Yield given. Multistep reaction;