Ferrous picrate

Ferrous Picrate. [C6H2(N02)30] 2Fe, mw 513.15, N 16.38%, dark green powder which expld feebly at 315—20°. It was obtained by drying the octahydrate in a vac dessicator over sulfuric acid. Its impact sensitivity was 14-15" (vs 14" for TNT). The octahydrate was obtained by treating a hot coned aq soln of ferrous sulfate with Ba picrate yel hexagonal prisms which turned brown on standing impact sensitivity 36"... 

Ferric nitrate, 107 Ferrous sulfate, 237 Fischer esterification, 248 Flavones, 13, 14,424 Fluoranthene picrate, 391 Fluorene-9-carboxylic acid, 101 Fluorenol, 455, 506... 

Wieland, 1907 Wieland and Wecker, 1910). Oxidation was carried out in an inert solvent such as benzene, from which the salt precipitated. The easier and more reliable preparation of perchlorate salts by the iodine-silver perchlorate method (Weitz and Schwechten, 1926, 1927), to which we have referred earlier (p. 168), allowed a much clearer understanding of the nature of triarylaminium ions to be obtained. Isolation of perchlorates permitted chemical studies, and easy reduction to the triarylamine by iodide ion, ferrous ion, etc., was consistent with the cation-radical view that was developed. The name aminium ion was coined by Weitz. Other salts were prepared such as tritolylaminium picrate (by oxidation of the amine with lead dioxide in the presence of picric acid), and it was also recognized that conjugate anions in salts obtained by oxidation with antimony pentachloride, phosphorus pentachloride and ferric chloride had to be complex anions rather than simple anionic radicals. This is a particularly pertinent point in antimony pentachloride oxidations (p. 165). 

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