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Reakcje utleniania wybranych grup funkcyjnych z wykorzystaniem oxone® jako źródła tlenu cząsteczkowego

Zawadzki P., Czardybon W., Chrobok A.

Wiadomości Chemiczne

2016

[Z] 70, 5-6

289--297

Oxidation reactions belong to the group of the most commonly used processes in both organic and inorganic chemistry. The main issues in such transformation are usually safe handling of the oxidants as well as waste generation. Peroxymonosulfuric acid is one of the strongest oxidants. It was described for the first time in 1898 by Heinrich Caro. Nowadays, the commercial sources of KHSO5 are low-cost industrial bulk chemicals, e.g., the triple salt Oxone® (2KHSO5· KHSO4·K2SO4). These products are stable oxidizing agents commonly used in fine chemicals synthesis, and are easy to handle, non-toxic as well as generate non-polluting by-products. Over the past several years the scope of its use has extended. One of the most important transformation that have been made possible with the use of Oxone® are epoxidation and ketone formation. Epoxides and ketones are important synthetic building blocks widely used in the chemical industry for the production of pharmaceutical products, flavours, fragrances, resins, adhesives and paints. The use of Oxone® was demonstrated in several combinations both in classical methods that involved metal catalysis as well as in novel approaches with the use of microwaves and ionic liquids. Over the past 20 years, ionic liquids, together with supercritical fluids and water, have become powerful alternatives to conventional organic solvents. Ionic liquids are salts having in the structure an organic cation and an inorganic or organic anion, with a melting point below 100°C. The advantage of using ionic liquids is a big variety of available structures. Combinations of both ionic liquids and Oxone® offer an interesting alternative to classical oxidation methods used in industry.

The synthesis of 1H-1,2,4-triazoles

Zieliński W., Czardybon W.

Polish Journal of Applied Chemistry

2001

Vol. 45, nr 3-4

79-83

An effective method of the synthesis of l,2,4-triazoles from phenyl hydrazonyl chlorides with the use of aluminium chloride as a catalyst was described.

The synthesis of 3,6-diaryl-dihydrotetrazines and tetrazines

Zieliński W., Czardybon W.

Polish Journal of Applied Chemistry

2000

Vol. 44, nr 1

37-40

New synthesis of 3,6-Diaryl-dihydrotetrazines has been developed. Easily accesible benzylidene-benzohydrazide derivatives were turned into hydrazonyl derivatives which were cyclocondesed in the prescence of titanium tetrachloride.