Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle.

  • Meyer, Hans (Hans Johannes Leopold), 1871-
Date:
1903
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Licence: In copyright

Credit: Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle. Source: Wellcome Collection.

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    atmospheric pressure does not materially change dur- ing the experiment. Compounds containing an amino as well as a diazo- group, such as diazoacetamide, may be decomposed by means of dilute hydrochloric acid; after the evolu- tion of nitrogen is completed the ammonium chloride in the flask c may be precipitated with hydrochloro- platinic acid and the amino and diazo nitrogen thus separately determined in one Operation. (B) Aromatic Diazo Compounds. (Diazonium Deriva- tives C.N.OH.) II] N The diazo group in aromatic Compounds is usually determined by the preceding method1 (3), p. 12 1, but it is preferable to employ a Lunge’s nitrometer and 40 per Cent sulphuric acid.2 Sulphuric acid, sp. gr. = 1.306, has a vapor tension of 9.4 mm at 1 50.3 A modification consists in dissolving the diazonium salt in ice-water, adding hydrochloric acid, and dis- placing the air by means of carbonic anhydride while the solution is in a freezing-mixture. Cuprous Chlo- ride is then added, and the liquid gradually heated to boiling. The necessary correction for dissolved air is ascertained by a blank experiment.4 On account of the action of acids in producing intra- 1 Knoevenagel, B. 23, 2997. v. Pechmann and Frobenius, Ihid. 27, 706. 2 Bamberger, Ibid. 27, 2598. 3 Regnault. 4 II. Goldschmidt and A. Merz, Ibid. 29, 1369 ; 30, 671; A. Ilautzsch, Ibid. 33 (1900), 2159.