Abstract
Long-chain N-alkylpyridinium salts (I-V) used as detergents and disinfectants were readily determined by the gas-liquid chromatography of the reduction products (VI-X) obtained by treatment with sodium borohydride and nickel(II) chloride. The procedure is useful for the routine analysis of N-alkylpyridinium salts, as the reduction takes place quantitatively and the reagents are relatively safe to handle, instead of the need to use a complicated apparatus for catalytic hydrogenation. The reduction products of I-V were identified as N-alkylpiperidines (VI-X), i.e., the perhydrogenated products, by mass spectrometry and elemental analysis. The reduction system described serves as a novel and convenient method for the synthesis of N-alkylpiperidines.
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