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        "name": "Pyridines", 
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    "author": [
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          "alternateName": "Division of Chemistry, Research Department, Ciba Pharmaceutical Products, Inc., Summit, New Jersey", 
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            "Division of Chemistry, Research Department, Ciba Pharmaceutical Products, Inc., Summit, New Jersey"
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        "givenName": "CHARLES F.", 
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    "datePublished": "1951-01", 
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    "description": "WE wish to describe briefly a convenient paper chromatographic separation and identification of pyridine derivatives in use in this laboratory for some time which employs a modification of the wellknown K\u00f6nig colour-reaction1. Leifer et al.2. have recently described the paper chromatography of nicotinic acid and nicotinamide, but the more involved microbiological method was used for defining the spots. In this laboratory the solvent used for the development of the compounds listed in the accompanying table is n-butyl alcohol saturated with 1.5 N ammonia. After evaporation of the solvent at room temperature, the dry paper is placed for fifteen minutes in a closed glass cylinder containing a few crystals of cyanogen bromide. The vapour pressure of this substance is high enough to provide a sufficient concentration for the first phase of the K\u00f6nig reaction. The paper is then sprayed with a 0.25 per cent solution of benzidine in 1 : 1 ethanolwater. Amounts down to 5\u03b3 can be detected easily. It should be pointed out that although nicotinic acid and iso-nicotinic acid cannot be distinguished on the basis of RF values, they can be distinguished by distinctive differences in colour. This technique should be generally applicable to all non-volatile pyridine derivatives giving a positive K\u00f6nig colour-reaction.", 
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        "type": "Periodical"
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      "chromatographic separation", 
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    "name": "Paper Chromatography of Pyridine Derivatives", 
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  }
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