Monolacunary K8SiW11O39-Catalyzed Terpenic Alcohols Oxidation with Hydrogen Peroxide

• Published in: Catalysis letters Vol. 148; no. 8; pp. 2516 - 2527
• Main Authors: da Silva, Márcio José, da Silva Andrade, Pedro Henrique, Ferreira, Sukarno Olavo, Vilanculo, Castelo Bandane, Oliveira, Cesar Macedo
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2018; Springer Nature B.V
• Subjects: Alcohol; Alcohols; Carbonyls; Catalysis; Catalysts; Catalytic activity; Cation exchanging; Chemical synthesis; Chemistry; Chemistry and Materials Science; Hydrogen peroxide; Industrial Chemistry/Chemical Engineering; Organometallic Chemistry; Oxidation; Physical Chemistry; Sodium silicates; Sodium tungstate; Titration; Lacunar silicotungstic acid potassium salt; Catalytic oxidation; Hydrogen peroxide; Terpenic alcohols
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-018-2434-0

Lacunar potassium undecasilicotungstate salt catalyst was highly efficient in oxidation reactions of terpenic alcohols with hydrogen peroxide. Carbonylic products were selectively obtained from alcohols such as borneol, nerol, geraniol and β-citronellol. The K 8 SiW 11 O 39 catalyst was synthesized in one pot reaction starting from precursor salts (KCl, Na 2 WO 4 , and Na 2 SiO 3 ). The catalyst salt was characterized by FT-IR, TG/DSC, BET, XRD analyses and potentiometric titration. The main reaction parameters were assessed. Based on experimental data, a reaction pathway was proposed. In borneol oxidation, TON of 2720 was achieved, indicating the high catalytic activity. As far we know, it is the first time where the monolacunar catalyst is used without an additional introduction of metal transition into Keggin anion. A comparison of the catalytic performance of different lacunar silicotungstic acid salts exchanged with different cations was performed. The K 8 SiW 11 O 39 catalyst was used without loss activity. Graphical Abstract