Synthesis of Carboxylic Acid by 2-Hexenal Oxidation Using Gold Catalysts Supported on MnO₂

Table 2

Effect of bimetal on 2-hexenal oxidation.

Catalyst	Conversion%	Selectivity%
		Dimer	2-Hexenoic acid
Au/MnO2	81.3	8.3	89.1
Au-Pd/MnO2	83.3	8.0	89.9
Pd/MnO2	73.6	7.5	89.2

Reaction conditions: 4.23 g of 2-hexenal, 0.06 g of catalyst, 50°C, 24 h, atmospheric pressure.
Dimer: 4,6-dipropyl-3,4,5,6-tetrahydropyran-2-one-5-carboxaldehyde.