3-(4-NITRO-2-SULFOPHENYLAZO)-2,4-PENTADIONE AS ACID-BASE INDICATOR FOR VISUAL DETERMINATION OF pH Russian patent published in 1997 - IPC

Abstract RU 2094429 C1

FIELD: chemical industry. SUBSTANCE: product: 3-(4-nitro-2- sulfophenylazo)-2,4-pentadione of formula: C₁₁H₁₁N₃O₇S, yield is 37 %. Reagent 1: 4-nitro-2-sulfophenyl diazonium chloride. Reagent 2: acetyl acetone. Reaction conditions: aqueous alkaline solution at pH of 3 for 3 minutes. EFFECT: improved properties of the indicator.

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RU 2 094 429 C1

Authors

Tepljakova A.Ju.

Kotov A.V.

Perevalov V.P.

Dates

1997-10-27—Published

1994-12-14—Filed