Recovery of substituted pyrrole acetate

Details Recovery of substituted pyrrole acetate Recovery of substituted pyrrole acetate

1980-05-29

1981-11-10

Rollins, Alton D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032635, C07D207337, C07D40906

Patent

active

042997704

ABSTRACT:
A process is provided for the recovery of aroyl-1,4-di (lower alkyl)-pyrrole-2-acetate in its lower alkyl ester form from an aqueous liquid medium initially containing said acetate in either its salt or lower alkyl ester form. The acetate ester in the aqueous medium can be saponified to salt form and a crop thereof can be recovered by cooling the medium to form a salt product which is insoluble in the remaining aqueous mother liquor. Subsequently, another crop of crude pyrrole salt can also be recovered from the mother liquor by concentrating the mother liquor. The resulting additional pyrrole acetate salt can be converted back into the acetate lower alkyl ester, which ester can then be recycled to a next batch of aqueous medium containing aroyl-1,4-di (lower alkyl)-pyrrole-2-acetate salt and/or ester.

REFERENCES:
patent: 3752826 (1973-08-01), Carson
patent: 3846477 (1974-11-01), Welstead, Jr. et al.
patent: 3952012 (1976-04-01), Carson
patent: 3957818 (1976-05-01), Carson
patent: 3998844 (1976-12-01), Carson
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patent: 4048191 (1977-09-01), Carson
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patent: 4119639 (1978-10-01), Carson
patent: 4187230 (1980-02-01), Wegand et al.
patent: 4213905 (1980-07-01), Carson
Carson et al.; J. Med. Chem. vol. 16, pp. 172-174, (1973).

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