Purification of crude pyrroles

Details Purification of crude pyrroles Purification of crude pyrroles

1994-01-21

1996-03-26

McKane, Joseph K.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548560, 548579, C07D20732

Patent

active

055022138

ABSTRACT:
A process for purifying crude pyrroles obtained in the preparation of pyrroles of the general formula I ##STR1## where R is hydrogen or a C.sub.1 -C.sub.6 -alkyl radical, which comprises treating the mixture containing the crude pyrrole with an acid or an activated carboxylic acid derivative and removing the pyrrole from the mixture by distillation at reduced pressure and at a bottom temperature of up to 160.degree. C.

REFERENCES:
patent: 3555021 (1971-01-01), Beutel et al.
patent: 4384125 (1983-05-01), Goettsch et al.
patent: 5039817 (1991-08-01), Kroker et al.
patent: 5116466 (1992-05-01), Marquis et al.
CA 106(7): 50031p Purification of N-methylpyrrolidone. Tomita et al., p. 626, 1987.

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