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Molecular sieves, complex organic bases and radical oxidants are commonly used in alcohols oxidation reactions. In this work, we have evaluated the beneficial effects of addition of K
2
CO
3
to Pd(II)-catalyzed oxidation alcohols, which resulted in a remarkable increase in the oxidation reaction rates without selectivity losses. Herein, in a metallic reoxidant-free system, terpenic alcohols (β-citronellol, nerol and geraniol) were selectively converted into respective aldehydes from Pd(II)-catalyzed oxidation reactions in presence of dioxygen. High conversions and selectivities (greater than 90%) were achieved in the presence of the Pd(OAc)
2
/K
2
CO
3
catalyst and pyridine excess. The exogenous role of others auxiliary anionic and nitrogen compounds was appraised.
Graphical Abstract
Reaction conditions: β-citronellol (2.75 mmol); Pd(OAc)
2
(0.05 mmol); pyridine (5.0 mmol); K
2
CO
3
(2.5 mmol); toluene (10 mL); MS3A (0.5 g); O2 (0.10 MPa); 60 °C.
Comparison of systems used in Pd(OAc)
2
-catayzed oxidation of β-citronellol by dioxygen