Production of 3,3-dimethyl-2-oxo-butyric acid salt

Details Production of 3,3-dimethyl-2-oxo-butyric acid salt Production of 3,3-dimethyl-2-oxo-butyric acid salt

1985-04-23

1990-02-06

Gray, Bruce

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5109

Patent

active

048989746

ABSTRACT:
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.degree. C. until about 60 to 80% of the chlorine has been introduced, and then heating the reaction mass to a temperature above 50.degree. 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.degree. 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 MnO.sub.2 precipitates out and is separated from the substantially pure dissolved salt of 3,3-dimethyl-2-oxo-butyric acid. The produce is a known compound suited for further syntheses.

REFERENCES:
patent: 4113767 (1978-09-01), Merz
Wittorf, N., Chemisches Central--Blaft, (1900), p. 29 of vol. II.
Beilstein, F. et al., Berichte der deutschen chemischen Gesellschaft, (1884), vol. 17, pp. 840-842.
Beilsteins Handbuch der Organischen Chemie, 4th Ed., (1921), vol. 3, pp. 273; 341; 608 and 697.

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