Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1993-03-29
1994-12-06
Cintins, Marianne M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C22900
Patent
active
053712854
ABSTRACT:
In a method of producing a keto acid having the general formula ##STR1## wherein R.sup.1 and R.sup.2 independently represent an alkyl of 1-6 carbons or a cycloalkyl of 4-8 carbons, by reacting an m-aminophenol having the general formula ##STR2## wherein R.sup.1 and R.sup.2 are the same as above, with phthalic anhydride, in an organic solvent, the improvement comprising effecting the reaction in an amount of the organic solvent which is insufficient to dissolve the keto acid produced in the reaction, so that at least a portion of the resultant keto acid crystallizes out of the solvent and allowing the reaction to proceed in a heterogeneous system.
REFERENCES:
patent: 1970908 (1933-12-01), Gubelmann
patent: 3394165 (1967-09-01), Pecherer
patent: 3455985 (1969-07-01), Sternbach et al.
Kondo Masahiro
Ooyoshi Hajime
Sakamoto Naoya
Tanaka Michio
Cintins Marianne M.
MacMillan Keith
Mitsui Petrochemical Industries Ltd.
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