orthoformic acid triethyl ester; zirconium tetrachloride in dichloromethane 0.833333 h; Ambient temperature;

lithium aluminium tetrahydride; zirconium tetrachloride in diethyl ether T=30°C; 12 h; Yields of byproduct given. Title compound not separated from byproducts;

triethylaluminum; diethyl aluminium hydride in hexane; kerosene 25 h; Heating;