JACKSON AND BOOS. — COLORED COMPOUNDS. 179 



Properties of the Addition Product of Propyl Picrate and Sodic Propy- 

 late. — It resembles the methyl compound closely, but its color is a some- 

 what lighter red, and it is not quite so stable when exposed to the air. 

 Acids decompose it giving propyl alcohol, recognized by the smell, and 

 the propyl picrate, which has not been described heretofore. Propyl 

 picrate crystallizes in fine nearly colorless needles, melting at 43°, and is 

 easily soluble in all the common solvents. If allowed to stand with 

 water or an acid, it is decomposed with the formation of picric acid. 



Action of Sodic Isoamylate on Picrylchloride. 



A benzol solution of picrylchloride was mixed with an excess of sodic 

 isoamylate dissolved in a little isoamyl alcohol, and the amorphous orange 

 precipitate formed was washed thoroughly with benzol and afterward 

 with water, and dried at first on a porous plate finally at 110°, when it 

 gave the following results on analysis : — 



0.2894 gram of the substance gave 0.0490 gram of sodic sulphate. 



Calculated for CeHaCNOoJsOCgHnNaOCgHji. Found. 



Sodium 5.62 5.48 



The formula C6HNa(NOo)30C5Hii requires 7.16 per cent of sodium. 



Properties of the Addition Product from Isoamyl Picrate and Sodic 

 Isoamylate. — This substance forms an orange amorphous mass, which is 

 decomposed by all the liquids which dissolve it, so that we could not 

 try to crystallize it. It is essentially insoluble in water or benzol. 

 Acids decompose it, setting free amyl alcohol, recognized by its smell, and 

 amyl picrate. 



Isoamyl Picrate, C6H2(N02)30C5Hii. 



This substance was obtained by the action of an acid on the addition 

 product just described. It was purified by crystallization from alcohol, 

 until it showed the constant melting point 68°-69°, when it was dried 

 in vacuo, and analyzed with the following result : — 



0.1311 gram of the substance gave on combustion 0.2117 gram of 

 carbonic dioxide and 0.0558 gram of water. 



Calculated for CeHaCNOslgOCsHu. Found. 



Carbon 44.14 44.02 



Hydrogen 4.34 4.73 



Isoamyl picrate crystallizes from alcohol in nearly colorless hexagonal 

 plates, which melt at 68°-69°. It is decomposed by standing with water 

 or acids, but in this respect is much more stable than propyl picrate. 



