Preparation of chlorinated phenoxyalkanoic acids

Details Preparation of chlorinated phenoxyalkanoic acids Preparation of chlorinated phenoxyalkanoic acids

1981-12-16

1985-05-07

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5956

Patent

active

045159858

ABSTRACT:
A process for the preparation of 2,4-dichloro- or 2-methyl-4-chlorophenoxyacetic acid or .alpha.-2,4-dichloro- or .alpha.-2-methyl-4-chlorophenoxypropionic acid by reacting phenoxyacetic or 2-methylphenoxyacetic acid or .alpha.-phenoxypropionic or .alpha.-2-methylphenoxypropionic acid with chlorine in water, wherein phenoxyacetic acid or phenoxypropionic acid is precipitated from an aqueous solution thereof, chlorine gas is passed into the resulting suspension of phenoxyacetic or 2-methylphenoxyacetic acid or .alpha.-phenoxypropionic or .alpha.-2-methylphenoxypropionic acid in water at from 30.degree. to 70.degree. C. at a rate not exceeding the rate at which it is consumed in the suspension, until from 100 to 110% of the theoretically required amount of chlorine gas has been taken up by the suspension, and the 2,4-dichloro- or 2-methyl-4-chloro-phenoxyacetic acid or .alpha.-2,4-dichloro- or .alpha.-2-methyl-4-chloro-phenoxypropionic acid is isolated from the suspension.

REFERENCES:
patent: 2717907 (1955-09-01), Orwoll
Zhurnal Prikladnoi Khimii, vol. 43 (1970), No. 12, pp. 2686-2692 (English Translation--pp. 2726-2730).

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