Fig. 4
From: Carboxylic acid-modified metal oxide catalyst for selectivity-tunable aerobic ammoxidation

Aerobic ammoxidation of 4-hydroxymethylbenzaldehyde. The ammoxidation of 1 can occur selectively on the aldehyde group to give hydroxynitrile product of 2, or can occur nonselectively to give dinitrile product of 3