Selective halogenation of 6-hydroxy picoline derivatives

Details Selective halogenation of 6-hydroxy picoline derivatives Selective halogenation of 6-hydroxy picoline derivatives

1985-03-11

1986-06-10

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546345, C07D21184

Patent

active

045944229

ABSTRACT:
The invention relates to a method for selective halogenation of 6-hydroxy picoline derivatives such as 6-hydroxy picolinic acid and 6-hydroxy picoline. When 6-hydroxy picolinic acid is halogenated by allowing it to stand in an aqueous mineral acid solution for a sufficient period to replace the halo substituent with a hydroxy substituent, and then halogenated, an improved yield of the 3-halo, 6-hydroxy picolinic acid to the 5-halo 6-hydroxy picolinic acid is obtained.

REFERENCES:
patent: 3859295 (1975-01-01), Schroder et al.

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