Determination of Pyridinium Nitrogen

Semimicro-Kjeldahl Procedure for Pyridinium Halide and Oxyhalide Salts

“…The ease, rapidity, and accuracy of this method recommend that it be extended to other elements. Schoniger (5) predicted its application to the determination of phosphorus, arsenic, and metals. This paper describes the combustion of organophosphorus compounds by the above procedure followed by either of two methods for the determination of the phosphorus.…”

“…Nitrogen present in a chain, as in amides and amines, is considered easier to determine than that present in ring structures, nitrogen-nitrogen linkages, and nitrogenoxygen linkages. However, with various modifications of the digestion procedures or a predigestion treatment of the organic nitrogen, this method of analysis is applicable to a wide variety of compounds (1)(2)(3)(4)(5)(6)(7).…”

Identification of Amines as Tetraphenylborates

“…The value of 220°C. is, however, correct, although mention should have been made that this value was obtained on the Kofler hot bar before significant decomposition had occurred (in 3 seconds from the time the sample is placed on the bar). This compound decomposes extremely rapidly, as indicated by the fact that the melting point measured 10 seconds after the sample is placed on the hot bar is already dowm to 190°C.…”