Method for purification of 2-alkyl-4-halo-5-formylimidazoles

Details Method for purification of 2-alkyl-4-halo-5-formylimidazoles Method for purification of 2-alkyl-4-halo-5-formylimidazoles

1994-02-16

1995-03-07

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23368

Patent

active

053959434

ABSTRACT:
The invention provides a method of purifying 2-alkyl-4-halo-5-formylimidazoles, which comprises dissolving an 2-alkyl-4-halo-5-formylimidazole in an aqueous solution of a sulfonating agent, adjusting the solution to pH 1-6, and removing the impurity 2-alkyl-4,5-dihaloimidazole by filtration or extraction.

REFERENCES:
patent: 5319094 (1994-06-01), Kakimoto et al.
patent: 5336779 (1994-08-01), Yamamoto et al.

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