Selective catalytic oxidation of benzyl alcohols to benzaldehydes with a dinuclear manganese(iv) complex

Syntheses, EPR spectral studies and crystal structures of manganese(II) complexes of neutral N,N donor bidentate Schiff bases and azide/thiocyanate as coligand

“…There has been considerable interest in synthesizing biomimetic complexes that can act as manganese containing enzymes such as superoxide dismutase (SOD) [1]. Interest in manganese complexes of varying nuclearities continues to be stimulated by the presence of manganese at the active sites of biological systems such as photosystem II in green plants, ribonucleotide reductase, superoxide dismutase, and the Mn catalases [2-9], the variability in magnetic behavior of polynuclear manganese clusters, which for some systems has been exploited in the development of information storage devices [10][11][12] and the use of such complexes as catalysts for bleaching and organic synthesis [13][14][15].…”

“…There has been considerable interest in synthesizing biomimetic complexes that can act as manganese containing enzymes such as superoxide dismutase (SOD) [1]. Interest in manganese complexes of varying nuclearities continues to be stimulated by the presence of manganese at the active sites of biological systems such as photosystem II in green plants, ribonucleotide reductase, superoxide dismutase, and the Mn catalases [2-9], the variability in magnetic behavior of polynuclear manganese clusters, which for some systems has been exploited in the development of information storage devices [10][11][12] and the use of such complexes as catalysts for bleaching and organic synthesis [13][14][15].In manganese biosystems, the azide ion is known to inhibit the superoxide dismutation in mononuclear superoxide dismutases via binding to the metal at the active site in both the Mn(II) and Mn(III) oxidation states [16]. The function of dinuclear active sites in Mn catalases, which catalyze the conversion of toxic peroxide to oxygen and water in certain bacteria, is also dramatically inhibited by azide [17][18][19][20][21][22].…”

Facile, mild and selective silica sulfuric acid catalyzed oxidation of benzylalcohols to benzaldehyde derivatives by potassium peroxodisulfate

“…The carbonyl compounds prepared in this solvent at a special time and their yields are listed in Table 3. As shown in Table 3, various types of benzylic alcohols were reacted efficiently with K 2 S 2 O 8 to afford corresponding aldehydes in good to excellent yields (entries [1][2][3][4][5][6][7][8][9][10][11][12]. Further oxidation of aldehydes to their carboxylic acids and also fragmentation products were not observed in this method.…”

“…Many methods using a variety of reagents have been reported over the years, most notably the Oppenhauer and Swern oxidations and reactions utilizing high valent metal compounds such as manganese dioxide, ammonium perruthenates and pyridinium chlorochromate. However, the majority of known methods generally suffer from one or more disadvantages such as difficulty in manipulation, long reaction times, and utilization of toxic reagents [1][2][3]. Therefore, it is still attractive to develop a new efficient oxidant with properties of high stability, low toxicity, ready availability and high selectivity for the benzylic oxidations and overcome typical problems that occur during oxidation and accept wide rang of alcohols with improved selectivity.…”

Diphenylmethane Oxidation Catalyzed by Mononuclear Mn(III) Complexes

“…[5][6][7][8][9][10][11][12][13][14][15][16][17] Recent studied have demonstrated that manganese complexes in combination with various oxidizing reagents catalyze a range of oxidation reactions, oxygenation of saturated [18][19][20][21][22][23] and aromatic hydrocarbons. [24][25][26][27] Although many studies performed on the oxidation of hydrocarbons by using Mn(III) complexes [28][29][30][31][32][33][34][35] and various peroxide substances as oxidants, there are few which used H 2 O 2 as a source of oxygen in the C-H oxidation of alkanes. 36 In recent decades, hydrogen peroxide has provoked significant interest in synthetic community and demonstrated to be a promising oxidant in organic synthesis since the oxidizing agent is economic, environmentally benign and powerful.…”