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On the selective oxidation of alcohols

Material. To adjoin Cro3 pyridine ligands for the formation of oxidants (ie, Collins oxidants), the reason unstable, fire burning, the main reason is the atmosphere in the pyridine lone pair of electrons on atoms susceptible to oxidation due to cr03. However, the ligand pyridine hydrochloride does not exist for this problem, so the existing chromium (Ⅵ) type ligands oxidants or quaternary ammonium salts are the property of Taiwan. However, not all of these things can be made of the ligand sets, we found that to get a stable oxidant, ligand must have two necessary conditions 43: ① itself has a certain stability, room temperature is not chromium (Ⅵ) The oxide; ② should have sufficient polarity to dissolve in water. Based on this experience we have found a number of chromium (Ⅵ) class selective oxidizing reaction mechanism for such problems, reported in literature vary. For the oxidation reaction of DMF as solvent,[link widoczny dla zalogowanych], we believe that it may also participate in DMF chromium (Ⅵ) and network units (Cr (Ⅵ) oxidant dissolved in DMF generated in the exothermic phenomenon) results reduce chromium (i, I) access to electronic ability to cause oxidative capacity decreased, so lively benzyl alcohol or allyl alcohol is first oxidized to highly selective four vision for the future now, people use chromium (Ⅵ) class oxidant selected primary alcohol has been resolved the problem of oxidation of aldehydes, also achieved with Tim poured hydroxyl allyl alcohol,[link widoczny dla zalogowanych], benzyl alcohol and ordinary alcohol selective oxidation of molecules, and both contain the same active hydroxyl molecules (ie hydroxyl or benzyl alcohol allyl alcohol hydroxyl) and lively with common hydroxyl and hydroxyl-selective for oxidation. However, the subject of alcohol oxidation is very rich, there are many problems waiting to be resolved, such as hydroxyl and 2o 1o selective oxidation of hydroxyl,[link widoczny dla zalogowanych], phenolic hydroxyl and the selective oxidation. Meanwhile, the mechanism of selective oxidation of alcohols is not clear. Chromium (Ⅵ) Although the class uses a wide range of oxidants, but there are some drawbacks, such as product separation difficult (due to tar-like substance is easy to form chromium) has not satisfactorily resolved,[link widoczny dla zalogowanych], the price of your side of these oxidants, it is not widely used in industrial fine . I believe that with the continuous efforts of people, many problems can be the perfect solution, chromium (Ⅵ) the application of class-oxidants will enter a new historical period.
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