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



Dipicoline methyl-iodide y 12 H u N 2 . 2 CH 3 1. — Obtained by 

 the action of excess of methyl-iodide on dipicoline, at the 

 ordinary temperature. It forms a reddish-brown oil, which 

 sol id i lies a tier some time. On treatment with anhydrous 

 alcohol, it changed to a bright yellow powder, almost insoluble 

 in alcohol and in ether, but readily soluble in water, giving 

 an almost colourless solution. It was dried and analyzed. 



Taken 0*2764 gram 



A g I 0>2638 g ram l _ 54.09 tw cent I 



Ag 0-0085 gram] ~ D4 ld P° r cent * i " 



C 12 H 14 N 2 . 2 CH 3 1 contains 54*24 per cent, of iodine. 



The methyl-hydrate, prepared by addition of silver oxide 

 and water to the methyl-iodide formed a colourless liquid, 

 which turned brown and evolved a peculiar smell on evapo- 

 ration. 



The methyl-chloride, obtained by addition of hydrochloric 

 acid to the methyl-hydrate, is a white crystalline salt. The 

 platinichloride is a buff-coloured precipitate, soluble in hot 

 water, and crystallizing out in yellow crystals when the solu- 

 tion cools. It was analyzed. 



Taken 0*1120 gram. 



Pt 0*0345 gram, = 30*80 per cent. 



C 12 H 14 N s .2CH 3 Cl.PtCl 4 contains 31*47 per cent, of 

 platinum. 



A strong solution of iodine in alcohol was added to a hot 

 solution of the methyl-iodide in aqueous alcohol ; brown scales 

 with coppery lustre separated out on cooling. This compound 

 was analyzed. 



Taken 0*4125 gram, 



Ag I 0*6245 gram, = 81-81 per cent, of I. 



By titration with sodium thiosulphate, this compound was 

 found to contain 61*25 per cent, of free iodine. 



C 12 H U N 2 .2CH 3 I.I 6 , 



the hexiodide of dipicoline methyl-iodide, contains 82*46 per 

 cent, of total iodine, and 61*85 per cent, of additive iodine. 

 This compound is insoluble in water, but dissolves sparingly 

 in alcohol with a deep yellow colour. It is insoluble in car- 

 bon disulphide. 



An aqueous solution of dipicoline, on addition of bromine 

 water, gave a very bulky buff-coloured precipitate. It was 

 dried over sulphuric acid and analyzed. 



Taken 0*4108 gram. 



Ag Br 0*5161 gram, = 53*46 per cent, of Br. 



