Hofmann on the Blue Derivatives of the Tertiary Monamines. 233 



whilst only the slight admixture is due to the presence, in the 

 original bases submitted to the action of iodide of amyle, of a small 

 quantity of chinoline, 



C 9 H 7 N. 

 In fact Mr. Williams, in describing the preparation of his dye, 

 distinctly states that the chinoline by no means requires to be pure 

 for the purpose. M. Menier has moreover kindly furnished me with 

 a considerable quantity of the crude material from which the green 

 crystals are obtained. This proved to be a mixture of several bases, 

 in which the presence of lepidine and chinoline was traced without 

 the slightest difficulty, by the analyses of platinum-salts. 



In the genesis of the new iodide two different phases have to be 

 distinguished, viz., 1, the transformation of lepidine into iodide of 

 amyllepidyl-ammonium, 



C 10 H 9 N + C 5 H n I = C^H^NI; 



Lepidine. Iodide of amyie. Iodide of amyl-lepidyl- 



ammonium. 



2, the condensation under the influence of potash of two molecules 

 of the compound into one molecule of a higher order, 



2(C 15 H 20 NI) + KHO=C 30 H 39 N 2 I-fKI + H 2 O. 



Iodide of amyl-lepidyl-ammonium. New iodide. 



It became indispensable to verify these reactions by the analysis of 

 additional compounds. 



The green crystals dissolve with facility in boiling dilute hydriodic 

 acid ; the colourless solution deposits on cooling yellow needles of 

 remarkable beauty, the analysis of which has furnished the values of 

 the formula 



e 30 H 40 N 2 I 2 =C 30 H 39 N 2 I,HI. 



These crystals are isomeric with iodide of amyl-lepidyl-ammonium, 

 from which, however, they are distinguished by all their properties. 

 They dissolve in cold water without decomposition, but on addition 

 of alcohol they immediately assume a blue coloration, the original 

 monacid compound being reproduced. The same change takes place 

 at 100° ; so that in preparing the compound for analysis it was neces- 

 sary to dry it in vacuo. In the facility with which the diacid com- 

 pounds are converted into the monacid salts, this substance resembles 

 rosaniline, which, as I have pointed out in a recent paper, forms 

 likewise colourless acid salts of little stability. 



The green iodide dissolves with equal facility in hydrochloric and 

 hydrobromic acid, yielding perfectly colourless solutions, and giving 

 rise to the formation of well- crystallized compounds, which contain, in 

 addition to iodine, respectively bromine and chlorine. 



On submitting the green iodide in alcoholic solution to the action 

 of chloride of silver, the whole of the iodine is separated in the form 

 of iodide of silver, a blue solution being obtained from which the 

 monacid chloride crystallizes, on slow evaporation, in green metal- 

 lustrous sharply- defined prisms of surpassing beauty. This salt 



