414 



Dr. J. Stenhouse on Nitro- substitution 



[Mar. 30, 



Theory. 

 C 7 = 84 

 H 3 = 3 

 Pb = 207 = 44 

 N 3 = 42 

 8 = 128 



464 



Its composition is therefore represented by the formula 

 C 7 H 3 (N0 2 ) 3 1 o 



Copper trinitro-orcinate, formed by dissolving cupric carbonate in a 

 strong aqueous solution of trinitro-orcinic acid, was with difficulty obtained 

 in the crystalline state in the form of small reddish-brown needles, which 

 are very soluble in water and alcohol, but are precipitated from their 

 solution in the latter menstruum by ether. 



Zinc trinitro-orcinate, formed from zinc oxide in a similar manner to the 

 copper salt, is likewise very soluble in water and alcohol, and crystallizes in 

 tufts of yellow needles. 



Silver trinitro-orcinate. — Trinitro-orcinic acid was dissolved in fifty times 

 its weight of boiling water, an excess of silver oxide added, and, after boiling 

 a few minutes, filtered from the undissolved silver oxide. On cooling, the 

 whole solidified to an orange-red gelatinous mass of the silver compound, 

 which exhibited no signs of crystallization. It is moderately soluble in 

 hot water ; and its solution gelatinizes on cooling. When boiled for any 

 length of time its solution slowly decomposes. Dried at 100° it gave the 

 following results : — 



I. '458 grm. substance gave '277 grm. argentic chloride. 



II. *398 grm. substance gave '241 grm. argentic chloride. 



Theory. I. II. Mean. 



C 7 = 84 

 H 3 = 3 



Ag 2 = 216 = 45-66 45-41 45'57 45-49 

 N 3 = 42 

 8 = 128 



473 



This corresponds to the formula 



C, H 3 (NOJ, 1 

 Aft/"*- 



Ethylic trinitro-orcinate. — Dry and finely powdered silver trinitro-orci- 

 nate was digested with ten times its weight of ethylic iodide until the silver 

 salt was completely decomposed, as shown by the pale yellow colour of the 

 silver iodide formed, the excess of ethylic iodide distilled off, and the ethyl 



I. II. III. Mean. 



62 44-34 44 36 44*54 44.41 



