O:Oxidizing agent;
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7722-64-7Relevant articles and documents
Sawhney, S. S.,Bansal, A. K.,Dangwal, D. N.
, p. 243 - 246 (1982)
Process for the preparation of optically active ortho-substituted 4-aryl-dihydropyridines
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, (2008/06/13)
The invention relates to a process for the preparation of optically active ortho-substituted 4-aryl- or heteroaryl-1,4-dihydropyridines by oxidation and subsequent reduction from their opposite enantiomers.
Production of 3,3-dimethyl-2-oxo-butyric acid salt
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, (2008/06/13)
Dichloropinacolone is produced by introducing into pinacolone twice the molar amount of chlorine, the exothermic reaction mass being cooled initially to maintain the temperature below about 50° C until about 60 to 80% of the chlorine has been introduced, and then heating the reaction mass to a temperature above 50° C during introducing of the remainder of the chlorine, thereby to produce dichloropinacolone, and terminating chlorine introduction when the dichloropinacolone content of the reaction mass is at least about 97%. The molten product is added to an aqueous solution of an alkali maintained at a temperature of at least about 50° C, the alkali being present in more than three times the molar amount of the dichloropinacolone. To the resulting solution of a salt of 3,3-dimethyl-2-hydroxy-butyric acid, brought to a pH of about 9 to 12, there is added approximately the stoichiometric amount of potassium permanganate. Solid MnO2 precipitates out and is separated from the substantially pure dissolved salt of 3,3-dimethyl-2-oxo-butyric acid. The product is a known compound suited for further syntheses.