İbrahim KANİ, Mehmet KURTÇA

Synthesis, structural characterization, and benzyl alcohol oxidation activity of mononuclear manganese(II) complex with 2,2'-bipyridine: [Mn(bipy)2(ClO4)2]

A manganese(II) complex of 2,2'-bipyridine (bipy) was synthesized and characterized by X-ray diffraction, IR, and UV-vis spectroscopy. The activity of the complex was tested for oxidation of benzyl alcohols using t-BuOOH as an oxidant in organic solvents and in an organic/water biphasic system (hexane/H2O, toluene/H2O). The effect of solvent, temperature, oxidant, and some additives (KBr, N(C4H9)Br, and N-bromosuccinimide) on the oxidation of benzyl alcohol is reported. The results show that benzyl alcohol was selectively converted to benzaldehyde in 71.9% yield within 4 h in acetonitrile. Control experiments performed without catalyst and the corresponding metal salt as catalyst produced no benzaldehyde in the reaction mixture. Mild reaction conditions, high yields of the products, short reaction time, no further oxidation to the corresponding carboxylic acids, high selectivity, and inexpensive reagents make this catalytic system a useful oxidation method for benzyl alcohol.

Anahtar Kelimeler:

Catalysis, oxidation, 2, 2'-bipyridine, manganese, benzyl alcohol

Synthesis, structural characterization, and benzyl alcohol oxidation activity of mononuclear manganese(II) complex with 2,2'-bipyridine: [Mn(bipy)2(ClO4)2]

Keywords:

Catalysis, oxidation, 2, 2'-bipyridine, manganese, benzyl alcohol,

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In summary, we synthesized and characterized a new manganese complex, [Mn(bipy)2(ClO4)2], and demon- strated its catalytic activity in the selective oxidation of benzyl alcohol to aldehyde under mild homogeneous conditions with environmentally benignt -BuOOH in acetonitrile. The high selectivity, eﬃciency, safety, and low cost of this complex make it a good choice for oxidant of benzyl alcohol.