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2 082 711

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IPC

(21) (22)

Application

93045968/04, 1993-09-29

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Actual filing date

1993-09-29

(45)

Published

1997-06-27

(72)

Inventor

Valitov R.B.Mannanova S.A.Nuritdinova Z.M.Piljugin V.S.Sapozhnikov Ju.E.Gudoshnikov S.K.Sharif'Janova L.N.Buslaeva L.I.Judinkov V.A.Glukhov V.A.Alferov B.A.Khabibullin R.R.Ikonnikov G.Ja.Valitov R.R.Davydov A.M.Kashin A.A.Brakhfogel' E.A.

(73)

Holder

Nauchno-Issledovatel'Skij Tekhnologicheskij Institut Gerbitsidov I Reguljatorov Rosta Rastenij An Respubliki Bashkortostan

METHOD OF SYNTHESIS OF 4-CHLOROPHENOXYACETIC OR 2,4-DICHLOROPHENOXYACETIC ACID Russian patent published in 1997 - IPC

Abstract RU 2082711 C1

FIELD: organic chemistry and technology. SUBSTANCE: product: 2,4-dichlorophenoxyacetic acid of empirical formula C₈H₆O₃Cl₂, m. p. is 138-138.5 C, yield is 88% or 4-chlorophenoxyacetic acid of empirical formula C₈H₅O₃Cl₂, m. p. is 149-150 C, yield is 85.7%. Reagent 1: phenoxyacetic acid. Reagent 2: elemental chlorine. Reaction conditions: in medium of glacial acetic acid at 60-65 C in the presence of acetic anhydride or mixture of acetic anhydride and chlorinated hydrocarbon and sodium chloride followed by crystallization at 8-13 C. Synthesized compounds were used for herbicide production. EFFECT: improved method of synthesis, increased yields. 2 cl, 1 tbl

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RU 2 082 711 C1

Authors

Valitov R.B.

Mannanova S.A.

Nuritdinova Z.M.

Piljugin V.S.

Sapozhnikov Ju.E.

Gudoshnikov S.K.

Sharif'Janova L.N.

Buslaeva L.I.

Judinkov V.A.

Glukhov V.A.

Alferov B.A.

Khabibullin R.R.

Ikonnikov G.Ja.

Valitov R.R.

Davydov A.M.

Kashin A.A.

Brakhfogel' E.A.

Dates

1997-06-27—Published

1993-09-29—Filed