Details

Autor(en) / Beteiligte

• Carari, Danieli M.
• da Silva, Márcio J.

Titel

A Highly Selective Pd(OAc)2/Pyridine/K2CO3 System for Oxidation of Terpenic Alcohols by Dioxygen

Ist Teil von

• Catalysis letters, 2012-02, Vol.142 (2), p.251-258

Ort / Verlag

Boston: Springer US

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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