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Application

3884148/04, 1985-04-15

(22)

Actual filing date

1985-04-15

(45)

Published

1997-03-10

(72)

Inventor

Anufrieva E.V.Nekrasova T.N.Sheveleva T.V.Kozhurnikova N.D.Prokhorova L.K.Borovik V.P.Koton M.M.Mamaev V.P.

METHOD OF QUANTITATIVE DETERMINATION OF ANHYDRIDE GROUPS IN PYROMELLITE DIANHYDRIDE AND 2(5)-(P-AMINOPHENYL)-5(2)-PHENYLPYRIMIDINE AS REAGENT FOR ITS REALIZATION Russian patent published in 1997 - IPC

Abstract SU 1311394 A1

FIELD: organic chemistry, analytical chemistry. SUBSTANCE: method involves the use of new reagent - 2(5)-(p-aminophenyl)-5(2)-phenylpyrimidine of the general formula (I) where: a) R1 - H at R2-NH2 or b) R1-NH2 and R1 - H. Analysis involves treatment of an analyzed sample with the indicated reagent in dimethylformamide solution followed by photometry. Precision of assay is 99.8%. Synthesis of Ia is carried out from sodium methylate and trimethine salt in methanol medium by heating at 80-90 C for 3 h followed by separation of Ia after cooling, yield is 96.7%, m. p. is 199-200 C. Synthesis of Ib is carried out from hydroxylamine sulfate, aqueous 25% NH3 and dioxane in the presence of CuBr at heating in autoclave at 160 C for 20 h followed by separation of Ib, yield is 93%, m. p. is 162-168 C. Invention can be used for control in thermostable polyimide materials production. EFFECT: increased precision of quantitative determination. 2 cl, 1 tbl

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SU 1 311 394 A1

Authors

Anufrieva E.V.

Nekrasova T.N.

Sheveleva T.V.

Kozhurnikova N.D.

Prokhorova L.K.

Borovik V.P.

Koton M.M.

Mamaev V.P.

Dates

1997-03-10—Published

1985-04-15—Filed

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