1: tert-butyl alcohol With Wilkinson's catalyst in toluene T=30°C; 0.333333 h; Inert atmosphere; 2: isobutyraldehyde With caesium carbonate in toluene T=30°C; 0.333333 h; Inert atmosphere; 3: With boron trifluoride diethyl etherate in toluene T=30 - 40°C; Inert atmosphere;