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2 053 217

(13)

C1

(51)

IPC

(21) (22)

Application

4882098/04, 1990-11-12

(22)

Actual filing date

1990-11-12

(45)

Published

1996-01-27

(72)

Inventor

Krasjuk I.I.Litvin B.L.

(73)

Holder

Ivano-Frankovskaja Firma

METHOD FOR PRODUCTION OF 5-CHLOROSALICYLIC ACID Russian patent published in 1996 - IPC

Abstract RU 2053217 C1

FIELD: organic chemistry. SUBSTANCE: essential formula of desired product is C7H5O3Cl, its melting point being 170 C. Salicylic acid is used as reagent 1. Reaction is carried out in aqueous medium at 50-75 C in the presence of 0.01-0.2 moles of dimethylformamide or methyl pyrrolidone or dimethylsulfoxide, or 0.005-0.02 moles of sodium chloride per 1 mole of salicylic acid. Molar ratio of salicylic acid, hydrogen peroxide and hydrochloric acid is 1:(1.4-1.7):(2.0-2.5) respectively. EFFECT: improves efficiency of method. 1 tbl

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RU 2 053 217 C1

Authors

Krasjuk I.I.

Litvin B.L.

Dates

1996-01-27—Published

1990-11-12—Filed

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