RuO4 Catalytic Oxidative Cleavage of Oleic Acid under Ultrasonic Irradiation
Chemical precipitation is the most common technology used to remove dissolved metals from industrial wastewater but generally, these chemical precipitation processes lead to sludge without any commercial or industrial values which are stored in specialized landfill. Previous works showed that sodium carboxylates can be used for the selective precipitation of metallic cations (Chemosphere 69 (2007) 763–768; J. Chem. Eng. Data, 50 (2005) 1833-1836).
The aim of this communication is (i) the oxidative cleavage of oleic acid to lead pelargonic acid and (ii) the using of sodium pelargonate as precipitant to perform selective precipitation of metallic cations.
The oxidative cleavage of oleic acid was realised under 20 KHz ultrasonic irradiation with the catalytic RuCl3/NaIO4. Associated with Aliquat® 336, this system allowed the free organic solvent oxidative cleavage (Tetrahedron Lett. 51 (2010) 3123–3126). However, the optimal mixture of solvents was H2O/MeCN (1/1): azelaic and pelargonic acids were obtained in 30 min with 81% and 97% yields respectively (Ultrason. Sonochem. 16 (2009) 266–272).