Process for preparing 4-bromotetrachloropyridine

Details Process for preparing 4-bromotetrachloropyridine Process for preparing 4-bromotetrachloropyridine

1980-06-16

1982-03-23

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D21302

Patent

active

043213898

ABSTRACT:
A process for producing 4-bromotetrachloropyridine or symmetrical tetrachloropyridine in high purity comprises the selective transhalogenation of pentachloropyridine by a bromide salt in a polar aprotic solvent at a temperature from about 100.degree. C. to about 140.degree. C. followed optionally by selective debromination by hydrogen in the presence of a noble metal catalyst and an acid acceptor to form tetrachloropyridine.

REFERENCES:
patent: 2725402 (1955-11-01), Britton et al.
Ivashchenko et al., Zh. Obshch. Khim., vol. 39, No. 8, pp. 1695-1697 (1969).
Ivashchenko et al., Chem. Abstracts, vol. 71, No. 25, 124,600f, Dec. 22, 1969.
Den Hertog et al., Rec. Trav. Chim., vol. 70, pp. 353-360, (1951).

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