oxygen; isobutyraldehyde; vanadium-substitutrd V-MCM-41 (A) zeolite in acetone T=25°C; 8 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;
Smith, John R. Lindsay; Sleath, Paul R.
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1982 , p. 1009 - 1016