Method of making cinnamic acid and salts thereof
First Claim
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7. A METHOD WHICH COMPRISES HEATING ONE MOLECULAR EQUIVALENT OF BETA-HYDROXY-BETA-PHENYL-PROPIONITRILE TO-ULE TO GETHER WITH FROM 1.25 TO 2 MOLECULAR EQUIVALENTS OFF SODIUM HYDROXIDE, IN THE FORM OF A FROM 5 TO 15 PERCENT BY WEIGHT AQUEOUS SOLUTION THEREOF, TO APPROXIMATELY THE BOILING TEMPERATURE OF THE MIXTURE AT ABOUT ATMOS-PHERIC PRESSURE FOR FROM 8 TO 10 HOURS, PRECIPITATING TARRY METERIAL FROM THE REACTION LIQUOR BY TREATING THE LATTER WITH AN ACID IN AMOUNT RENDERING THE LIQUOR ONLY SLIGHTLYLY ALKALINE AND REMOVING THE PRECIPITATE, THEREAFTER ACIDI-FYING THE LIQUOR TO PRECIPITATE CINNAMIC ACID THEREFROM AND SEPARATING CINNAMIC ACID FROM THE MIXTURE.
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7 Claims
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7. A METHOD WHICH COMPRISES HEATING ONE MOLECULAR EQUIVALENT OF BETA-HYDROXY-BETA-PHENYL-PROPIONITRILE TO-ULE TO GETHER WITH FROM 1.25 TO 2 MOLECULAR EQUIVALENTS OFF SODIUM HYDROXIDE, IN THE FORM OF A FROM 5 TO 15 PERCENT BY WEIGHT AQUEOUS SOLUTION THEREOF, TO APPROXIMATELY THE BOILING TEMPERATURE OF THE MIXTURE AT ABOUT ATMOS-PHERIC PRESSURE FOR FROM 8 TO 10 HOURS, PRECIPITATING TARRY METERIAL FROM THE REACTION LIQUOR BY TREATING THE LATTER WITH AN ACID IN AMOUNT RENDERING THE LIQUOR ONLY SLIGHTLYLY ALKALINE AND REMOVING THE PRECIPITATE, THEREAFTER ACIDI-FYING THE LIQUOR TO PRECIPITATE CINNAMIC ACID THEREFROM AND SEPARATING CINNAMIC ACID FROM THE MIXTURE.
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Current AssigneeRobert S. Montgomery
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Original AssigneeRobert S. Montgomery
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InventorsMontgomery, Robert S.
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Application NumberUS03/324,830Time in Patent Office1,709 DaysField of SearchUS Class Current562/495CPC Class CodesC07C 51/08 from nitrilesC07C 51/377 by splitting-off hydrogen o...C07C 57/44 Cinnamic acid
