78 



Dr. J. Stenhouse on Chlorine- and 



[Dec. 21, 







I 



II. 



III. 



TV 



TV/Toon 



iyj.cdu ■ 



7 



= 84= 24-07 



24-06 



24-08 







24-07 





= 4= 1-15 



1-31 



1-34 







1-32 



ci 



= 213= 61-03 







60-94 



60-75 



60-85 





= 48= 13 75 















349 100-00 













The rational formula deduced from the percentage composition of the 

 substance is C 7 H 4 Cl 6 3 ; and I propose to give it the provisional name of 

 pentachlororcin hypochlorite, C 7 H 3 Cl 5 2 , H CI O, until its constitution 

 is more satisfactorily made out by an examination of the products of its 

 decomposition. 



Chlorresorcin. 



Pentachlorresorcin, C 6 H Cl 5 2 . — An attempt was made to obtain a 

 chlorresorcin by submitting resorcin to the action of chlorine hydrate in a 

 manner similar to that which had been so successfully employed in pre- 

 paring pentachlororcin ; but the results obtained were unsatisfactory, the 

 product being very small in comparison to the resorcin taken, and even that 

 so contaminated with oily impurities that further examination was deemed 

 inexpedient. The action of potassium chlorate and hydrochloric acid, 

 however, gave a much more favourable result. Five parts of potassium 

 chlorate and a solution of two parts of resorcin in eight of hydrochloric 

 acid were gradually added to forty parts of hydrochloric acid, which was . 

 prevented from becoming very hot by immersion in cold water. The ope- 

 ration was conducted in a manner similar to that previously described in 

 the preparation of pentachlororcin ; but more care was required to obtain a 

 successful result, and the amount of product was comparatively small, about 

 70 per cent, of the resorcin. The crystalline compound which is deposited 

 on standing was collected, and, after being simply pressed to remove some 

 of the mother-liquor, boiled with a considerable quantity of carbon disul- 

 phide. The supernatant aqueous layer was then separated by means of a 

 separating-funnel, and the greater portion of the carbon disulphide removed 

 by distillation. When sufficiently concentrated the anhydrous chlorresorcin 

 crystallized out in brilliant colourless plates or flattened prisms. One or 

 two recrystallizations rendered it pure. The crude product of the action 

 of the chlorate and hydrochloric acid on resorcin appeared to consist prin- 

 cipally of a hydrate of the chlorresorcin, as when it was rapidly heated for 

 a short time with a comparatively small proportion of carbon disulphide, 

 and the solution filtered, it deposited a white crystalline compound in minute 

 scales, sparingly soluble in the disulphide. On submitting the solution to 

 distillation, however, to remove the excess of carbon disulphide, water passed 

 over with the latter, and the solution, when sufficiently concentrated, de- 

 posited large crystals of the anhydrous substance. Pure pentachlorresorcin 

 is colourless, and melts at 92°*5. It is moderately soluble in warm water, 



