1: 86 percent / lithium aluminium hydride, t-butyl alcohol / bis-(2-methoxy-ethyl) ether / 1 h / -75 deg C - room temperature 2: sodium borohydride / methanol View Scheme

in benzene steam-bath;

lithium aluminium tetrahydride; tert-butyl alcohol in diethylene glycol dimethyl ether 1 h; -75 deg C - room temperature;