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

Table 3

Effect of preparation methods on 2-hexenal oxidation using 1% Au/MnO₂.

Method	Conversion%	Selectivity%
		Dimer	2-Hexenoic acid
Sol	81.3	8.3	89.1
Impregnation	76.1	7.8	89.1
DP	77.6	6.2	90.3

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.