Process for the production of beta-diketone

Details Process for the production of beta-diketone Process for the production of beta-diketone

1994-03-07

1995-10-10

Reamer, James H.

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

Organic compounds

Oxygen containing

C07C 4545

Patent

active

054572363

ABSTRACT:
In a process for preparing betadiketones which comprises an alkaline condensation of an ester and an acetophenone in the presence of an alkaline catalyst in an inert organic solvent, the improvement comprising at least one of the following conditions:
(i) adding the acetophenone to the reaction mixture in a time period sufficiently short whereby degradation products in the reaction mixture are minimized;
(ii) at the completion of the reaction, adding additional solvent to rapidly decrease the temperature of the reaction product mixture.
(iii) mixing the organic solvent phase with the aqueous acid phase in the acidification step for a time period sufficiently long whereby the concentration of alkali metal remaining in the organic solvent phase is substantially zero; and
(iv) decreasing the time between the completion of the acetophenone addition step and the initiation of the acidification step.

REFERENCES:
patent: 4028417 (1977-06-01), Muller et al.
patent: 4175012 (1979-11-01), McKay et al.
patent: 4387089 (1983-06-01), De Polo
patent: 4482245 (1984-11-01), Maulding
patent: 4562067 (1985-12-01), Hopp et al.
patent: 5015777 (1991-05-01), Chisolm et al.

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