Analytical Methods for Organic Cyano Groups by M. R. F. Ashworth

By M. R. F. Ashworth

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After leaving for 20 min at ca. 0° they filtered and also determined the excess silver ion in the filtrate by thiocyanate titration, potentiometrically or with ferric ion indicator. Johnson* * modified Harger's method by treating an aliquot of the sample solution with nitric acid, sodium picrate, and excess standard silver nitrate at 5°. After 15 minutes at this temperature, the precipitate was filtered off and excess silver ion in the filtrate was titrated with thiocyanate. Johnson claimed that, under these conditions, a precipitate of composition C6H2(NC>2)30Ag-C2H4N4 was formed which changes only slowly into the 1:1 compound at the low temperature used.

A 63 64 65 65 58 66 54 A N A L Y T I C A L M E T H O D S FOR O R G A N I C C Y A N O GROUPS (b) Formation of Silver Salts Better known are analytical methods based on formation of metal derivatives, chiefly with silver, but also with copper(II) and lead(II). 25) + 2 yields a yellow product. g by Korinfskii* * and by Beeling and Laabs< >. Milks and Janes< > and K n a p p e and Rohdewald* ) have used, amongst others, an ammoniacal spray reagent for detecting urea derivatives on paper chromatograms and thus visualised cyanamide through the yellow colour.

L . a n d ZILIOTTO, H . , Ind. Eng. , Anal. Ed. 17, 211 (1945). SIGGIA, S . a n d S T A H L , C . R . , Anal. Chem. 2 7 , 550 (1955). BRAUNIGER, H . a n d SPANGENBERG, K . , Pharmazie 12, 4 8 8 (1957). MEYERS, R . T . , Ohio J. Sci. 5 8 , 34 (1958). K A U F M A N N , H . P . a n d C H O W D B U R Y , D . K . , Chem. Ber. 9 1 , 2117 (1958). FEIGL, F . , Anal. Chem. 3 3 , 1 1 1 8 (1961). PESEZ, M . , B A R T O S , J . , a n d LAMPETAZ, J . - C , Bull. Soc. Chim. France 719 (1962). H U B E R , W .

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