74 



Dr. J. Stenhouse on Chlorine- and [Dec. 21, 



of the substance. The solution then immediately deposited the chlororcin, 

 and occasionally became hot enough to cause ebullition of the carbon disul- 

 phide. Two or three crystallizations rendered it quite pure. Pentachlor- 

 orcin crystallizes from carbon disulphide in large colourless prisms, melting at 

 120°*5. It is moderately soluble in bisulphide of carbon and benzol, and 

 readily in ether. It dissolves somewhat in cold alcohol, and when boiled 

 with it for some time undergoes a change which I have not as yet investi- 

 gated, — water throwing down an oil which only solidifies after having been 

 exposed to the air for some days in a shallow vessel. The pentachlororcin 

 is but very slightly soluble in water, to which, however, it communicates 

 an exceedingly disagreeable and persistent bitter metallic flavour. When 

 boiled with water it is decomposed, an oil and a crystalline solid passing over 

 with the vapour. The oil, which has a peculiar odour, recalling that of 

 chloropicrin, is heavier than water; the solid compound crystallizes in 

 needles, and is identical with the trichlororcin described below. When 

 heated with concentrated sulphuric acid it blackens and decomposes, giving 

 off hydrochloric acid. It dissolves in nitric acid by the aid of heat, and 

 crystallizes out unchanged on cooling. The addition of water to the 

 solution precipitates the pentachlororcin. By long boiling with the acid it 

 is decomposed with evolution of nitrous fumes. 



Analysis of Pentachlororcin. 



I. *90 1 grm. substance gave '937 grm. carbonic anhydride and -096 grm. 

 of water. 



II. * 1 96 grm. substance gave -4/3 grm. argentic chloride. 



III. '360 grm. substance gave '8/1 grm. argentic chloride. 



IV. *229 grm. substance gave -555 grm. argentic chloride. 



V. *202 grm. substance gave -488 grm. argentic chloride. 



Theory. I. II. III. IY. Y. Mean. 



C 7 = 84 =28-33 28-36 .. .. .. 28'36 



H 3 = 3 = 1-01 1-18 .. .. .. .. 1-18 



Cl 5 = 177*5 = 59 , 87 .. 5970 59*85 59 96 59-75 59'82 



2 = 32 =10-79 .. .. .. 



296-5 



V. was prepared by the action of potassium chlorate and hydrochloric 

 acid, I., II., III., and IV. by means of chlorine hydrate. The substance 

 was dried in vacuo. 



Trichlororcin, C 7 H 5 Cl 3 2 . — When pentachlororcin was heated with 

 hydriodic acid to 100° it was decomposed, trichlororcin being formed 

 and iodine set free. The best method of conducting the operation, so as 

 to obtain a pure product, was to add the pentachlororcin in small portions 

 to a mixture of amoiphous phosphorus and hydriodic acid, containing 

 eight or ten per cent, of iodine, and to digest between each addition until 



