Aerobic oxidation of alkyl arenes and alcohols using cobalt(II) phthalocyanine as a catalyst in 1-butyl-3-methyl-imidazolium bromide

A Waste-Free and Highly Effective Catalytic System for the Oxidation of Cysteine to Cystine

“…It is well-known that molecular oxygen can be catalytically activated by transition metal phthalocyanine complexes [11][12][13][14][15][16][17]. However, the parent metal phthalocyanine complexes are less soluble in water and common organic solvents, which limit their application in catalysis [18].…”

Oxidation of Ethylbenzene in the Presence of an MCM-41-Supported or Ionic Liquid-Standing Bischlorocopper(II) Complex

“…29 Si cross-polarisation (CP) MAS NMR spectra were recorded at 5 kHz with 4.25 ls 1 H 90°pulses, 8 ms contact time, and 5 s recycle delays, and at 9 kHz with 3.4 ls 1 H 90°pulses, 1.5 ms contact time, and 5 s recycle delays. 13 C CP MAS NMR spectra were acquired with a 3.5 ls 90°p roton pulse and 2 ms contact time with spinning rates of 7-8.5 kHz and 4 s recycle delays. Chemical shifts are quoted in parts per million from tetramethylsilane.…”

“…Seddon and Stark [12] reported that the Co(acac) 2 catalysed oxidation of PhEt in 1-hexyl-2,3-dimethylimidazolium tetrafluoroborate ([C 6 dmim]BF 4 ) in the presence of perfluorohexane (added to concentrate the dissolved oxygen) gave PhCOMe as the only product with 25% yield within 24 h at 80°C and 1 atm of O 2 . More recently Shaabani et al [13] reported a PhCOMe yield of 77% within 7 h at 100°C and 1 atm of O 2 using a cobalt(II) phthalocyanine complex as a catalyst in 1-butyl-3-methylimidazolium bromide ([C 4 mim]Br) as the solvent.…”

“…The replacement of acetonitrile as a reaction solvent would be an important development, given its flammability and toxicity. Surprisingly, only a few papers have dealt with the use of ionic liquids (ILs) as solvents for the oxidation of PhEt [12,13], despite the intensive research that has been carried out in the last decade in the area of catalysed oxidations in ILs [14]. ILs are potential ''green'' alternatives to volatile organic solvents, with the added advantage of facile catalyst and solvent recycling.…”

Designed synthesis of multifunctional Fe 3 O 4 @SiO 2 –NH 2 @CS–Co(II) towards efficient oxidation of ethylbenzene

“…Simultaneously, there has been an increased interest in developing transition metals, such as Co(II), Mn(II) and Cu(II), involved catalysts for the selective oxidation of EB [10][11][12][13]. In particular cobalt-based catalysts, because of their plausible potential as commercial catalysts, are mostly investigated and quite a number of studies have been conducted over both homogenous and especially heterogeneous ones [8,10,11,[14][15][16].…”