Process for the preparation of 3,5,6-trichloropyridin-2-ol

Details Process for the preparation of 3,5,6-trichloropyridin-2-ol Process for the preparation of 3,5,6-trichloropyridin-2-ol

1989-05-12

1991-02-26

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546303, 558398, 558440, 558441, C07D21364

Patent

active

049963236

ABSTRACT:
The preparation of 3,5,6-trichloropyridin-2-ol from trichloroacetyl chloride and acrylonitrile is improved by separately conducting the individual addition, cyclization and aromatization steps. By separating the steps, water and HCl, by-products of the latter steps, can be precluded from interfering with the earlier steps. The individual process steps have also been improved.

REFERENCES:
patent: 3007931 (1961-11-01), Simpson et al.
patent: 4245098 (1981-01-01), Steiner et al.
patent: 4327216 (1982-04-01), Martin
patent: 4435573 (1984-03-01), Lysenko et al.
patent: 4465186 (1987-05-01), Steiner et al.
patent: 4468354 (1984-08-01), Lysenko et al.
patent: 4469896 (1984-09-01), Steiner et al.

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