Dr. W. Ramsay on Picoline and its Derivatives. 277 



were analyzed by distillation with a solution of sodium 

 hydrate, the picoline being received in hydrochloric acid and 

 estimated as platinochloride. 



0*5500 grin, gave 0*314 grm. of platinum = 0*3015 grm. 

 of picoline, or 54*81 per cent. The formula 4 H 6 6 . 2 C 6 

 H 7 N requires 55*35 per cent. 



With citric acid picoline forms an uncrystallizable syrup. 

 It refuses to combine with acetic or formic acid ; and an attempt 

 to prepare a chromate was also unsuccessful. The phosphate 

 is a crystalline mass which rapidly absorbs water. The chlorate 

 formed diamond-shaped crystals of extreme thinness. It ex- 

 plodes when heated ; it was prepared by neutralizing the free 

 acid with picoline, and is sparingly soluble in water. 



Picoline mercuric chloride, C 6 H 7 N . Hg Cl 2 , is precipitated 

 as a white powder by adding picoline to a solution of mercuric 

 chloride. It is sparingly soluble in cold, but dissolves more 

 easily in hot water, from which it crystallizes in needles. It 

 is more soluble in alcohol, and crystallizes from that solvent 

 in plates. On analysis 75*6 and 76*1 per cent, of mercury 

 were found instead of 74*27, demanded by theory. This com- 

 pound is not acted on by chlorine. 



Compounds of Picoline with the Haloid Compounds of Alcohol 

 and Acid Radicals. 



1. With Alcohol Radicals. Picoline Methyl Salts. — Equal 

 volumes of picoline and methyl iodide were mixed in a tube, 

 which was tightly corked and allowed to stand for some time. 

 The mixture became turbid and grew very warm, and partially 

 solidified. As soon as the tube was cold, the excess of methyl 

 iodide was distilled off, and the solid residue dried between 

 folds of bibulous paper and recrystallized from alcohol, in which 

 it is moderately soluble. It crystallized in long white needles. 

 Picoline methyl iodide is slightly deliquescent, and melts at 

 226*5-227° (uncorr.). 



The methyl chloride was prepared from the methyl iodide 

 by boiling an aqueous solution of the latter with silver chloride. 

 On evaporation on the water-bath it formed a syrup, which 

 soon solidified to a crystalline mass. It is extremely deli- 

 quescent, and becomes moist after exposure to air for a few 

 seconds. It crystallizes from alcohol in needles. The plati- 

 num salt crystallizes in small cubes. 



0*1583 grm. of the platinum salt gave 0*0481 grm. of 

 platinum = 30*38 percent, of Pt. 



Theory for (0 ? H 7 N . CH 3 Cl) 2 Pt Cl 4 , 30*33 per cent. 



The methyl nitrate, prepared from the methyl iodide by 

 addition of silver nitrate, crystallizes in long transparent prisms, 



