212 DR T. ANDERSON ON SOME OF THE 



line flocks of bromopianyl are immediately deposited, which are purified by solu- 

 tion in boiling spirit. Bromopianyl is thus obtained in colourless transparent 

 needles, very sparingly soluble in water, much more so in alcohol and ether. It 

 is rather more fusible than chloropianyl, its melting point being 332 J ; but in its 

 general characters and relations to acids and bases it is so similar to that sub- 

 stance that the same words may serve to describe both. Its analysis gave — 



{5-105 grains of bromopianyl , dried at 212°, gave 

 8-202 ... carbonic acid, and 

 1-565 ... water. 



f 4-200 grains of bromopianyl gave 

 12-883 ... bromide of silver. 



Experiment. 



i 



Calculation. 





43-81 



43-95 



^20 



120 



3-40 



3-29 



H 9 



9 



29-21 



29-30 



Br 



80 



23 58 



23-46 



o 8 



64 



Carbon, .... 



Hydrogen, 



Bromine. 



Oxygen, , 



10000 100-00 273 



corresponding with the formula C 20 H Br 8 . 



Action of Chloride of Iodine on Opianyl. 



Iodine, whether in solution in alcohol or in the solid form, is entirely without 

 action on opianyl. I therefore tried whether the ingenious process described by 

 Mr Brown for causing the substitution of iodine for hydrogen would succeed in this 

 case, and the experiment proved completely successful, although the change was 

 very slowly effected. When chloride of iodine was added to an aqueous solution 

 of opianyl, no crystals were deposited at first, and the fluid retained its colour. 

 It was placed upon the sand-bath, in a moderately warm place, where it was left 

 for several days, at the end of which time crystals of an inch in length, and mixed 

 with some iodine had deposited. The crystals were separated, and dissolved in 

 boiling alcohol, which deposited them pure and colourless. 



Iodopianyl is obtained in colourless needles of considerable size and great beauty, 

 which are scarcely soluble in water, but dissolve in alcohol and ether. At 234° 

 it fuses to a colourless liquid, which soon becomes brown, and at a higher tem- 

 perature it is decomposed and iodine evolved. Nitric acid destroys it, with sepa- 

 ration of iodine. Sulphuric acid dissolves it, and on heating a dark colour is 

 produced. Its analysis gave — 



{6-993 grains of iodopianyl gave 

 9-530 ... carbonic acid, and 

 1-865 ... water. 



f 4-735 grains of iodopianyl gave 

 13-460 ... iodide of silver. 



