1873.] Dr. J. Stenhouse on Amido-derivatives of Orcin. 125 



Theory. I. 



C 7 = 84 = 45-40 45-59 



H u = 11 = 5-95 5-95 



N 3 = 42 = 22-70 



3 = _48 = 25-95 



185 100-00 



It will be seen that the results of the analyses agree with the formula 

 C 6 (CH 3 ) (1N"H 2 ) (NH) a (HO) 2 +H 2 O for the substance dried at 100°, and 

 the formula for the substance dried in vacvo is probably 



C 6 (CH 3 ) (KB,) (SB), (HO) 2 +2H 2 O, 



as it requires 8*87 per cent, water. 



Triamido-orcin. — The colourless solution obtained by the reduction of 

 trinitro-orcin with tin and hydrochloric acid, after removal of the tin by 

 sulphydric acid, appears to contain triamido-orcin hydrochloride along with 

 excess of hydrochloric acid. On concentrating the solution at 100° much 

 of the triamido-orcin is decomposed and a considerable amount of ammo- 

 nium chloride formed ; whilst, although long needles of triamido-orcin 

 hydrochloride are obtained by evaporating it in a vacuum, yet, owing to 

 their great solubility and the readiness with which they absorb water and 

 deliquesce, the salt has not yet been obtained in a state fit for analysis. 

 On moistening the crystals of this hydrochloride with ammonia, they be- 

 come almost instantaneously converted into the metallic green needles of 

 the amido-diimido-orcin. 



If a current of sulphuretted hydrogen be passed through a solution of 

 ammonium sulphydrate in which amido-diimido-orcin is suspended, the 

 latter rapidly loses its colour and becomes converted into a sandy deposit 

 consisting of colourless crystals. These are apparently triamido-orcin, 

 and may be washed by decantation with a dilute solution of ammonium 

 sulphydrate, in which they are but slightly soluble. These crystals rapidly 

 acquire the metallic green lustre of amido-diimido-orcin when exposed to 

 the air, and are readily soluble in dilute acids. The hydrochloric-acid 

 solution behaves in a manner precisely similar to that obtained by the 

 reduction of trinitro-orcin with tin and hydrochloric acid, becoming deep 

 red, and depositing crystals of amido-diimido-orcin hydrochloride when 

 exposed to the air. 



Amido-diimido-orcin hydrochloride. — The hydrochloride obtained in the 

 preparation of amido-diimido-orcin, as described in the earlier part of this 

 communication, may be purified by crystallization from hot water ; but as 

 heat decomposes solutions of the salts of this base, it is better to precipi- 

 tate a cold solution of the acetate by a slight excess of hydrochloric acid, 

 in which the hydrochloride is but slightly soluble : the precipitate should 

 be thoroughly washed with alcohol, pressed, and dried. 



Pure amido-diimido-orcin hydrochloride crystallizes in different ways? 

 according to the circumstances under which the crystals are formed. As 



II. Mean. 



45-77 45-68 

 5-81 5-88 



