Alcohol oxidation plays an essential contribution to the chemical industry. Innovative green techniques, such as ultrasound irradiation, could be economically remarkable by enhancing reaction yield. In this research, design and improvement of a new ultrasound-assisted alcohols procedure using CrO3 supported Al2O3 with addition small amount t- butanol were reported. The was also done without irr...

The oxidation of some cyanocycloheptatrienes with CrO3 and pyridine was investigated and a few new nitrile functionalised benzotropone derivatives were obtained. Photooxygenation reaction of these products was also studied. The structures of the formed products were determined on the basis of NMR spectroscopy and the formation mechanism of unusual products was discussed. Human carbonic anhydras...

Mannitol-containing oligosaccharides have been isolated from a rat brain proteoglycan after mild alkaline borohydride treatment under conditions which prevent "peeling." Their structural properties were studied by gas-liquid chromatography-mass spectrometry of disaccharides as their trimethylsilylated and permethylated derivatives, methylation, analysis, specific degradations, and CrO3 oxidatio...

9-epi-Leucomycin A5 has been obtained from leucomycin A5 (I) by the following reaction sequence. Leucomycin A5 (I) was treated with Collins reagent (CrO3-pyridine) in the presence of water (13%) to provide 9-dehydroleucomycin A5 (II) in 95% yield. The formyl group was internally protected by the reaction of II with acetic anhydride-K2CO3 to afford 18,2'-di-O-acetyl-9-dehydroleucomycin A5-3,18-h...

Louisianin A (1) was treated with phosphoryl chloride (POC13) at 120~ 125°C3) to obtain chloro derivative (2) in 86% yield. 2 was reduced by Zn-AcOH at 50°C4) to afford 3 (52% yield) and 4 (35% yield). Furthermore, under the same condition, 3 was dechlorinated to give 4 in 48% yield. Moreover, 4 was oxidized in the treatment of CrO3-pyridine5) to obtain louisianin C (5) in 75% yield. Finally, 5...

Chromia (Cr2O3) nanoparticles have been successfully synthesized via the facile solvothermal process, by using CrO3 in butanol and propanol as solvents. The functional groups of the samples were tested by the Fourier Transform Infrared (FTIR) spectroscopy. The as-synthesized nanoparticle sizes are calculated and confirmed to be 34 and 40 nm, by using X-ray Diffraction (XRD) and Transmission Ele...