1871.] Bromine-substitution Compounds of the Orcins. 79 



from which it separates, on cooling, in a white opaque mass of indistinct 

 crystals, apparently the hydrate. It is readily soluble in carbon disul- 

 phide, benzol, and petroleum-oil, and very soluble in alcohol and ether. 



Analysis of the Chlorresorcin. 



I. '476 grm. substance gave -447 grm. carbonic anhydride and '020 grm, 

 water. 



II. *308 grm. substance gave -289 grm. carbonic anhydride and *01 3 grm. 

 water. 



III. '193 grm. substance gave *490 grm. argentic chloride. 



IV. *259 grm. substance gave '659 grm. argentic chloride. 



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



C 6 = 72 = 25-49 25-56 25-60 .. .. 25-58 



H= 1 = 0-35 0-47 0-47 .. .. 0-47 



Cl 5 =177*5= 62-84 .. .. 62-81 62-95 62-88 



O a = 32 = 11-32 .. 



282-5 100-00 



The results of the analysis correspond very nearly to the formula 

 C 6 HC1 5 2 , that of pentachlorresorcin. This somewhat anomalous com- 

 position was, however, confirmed by the analyses of the corresponding 

 bromine compound. 



Bromresorcin. 



Pentabromresorcin, C 6 H Br 5 2 . — This compound was prepared by add- 

 ing resorcin solution to a mixture of bromine and water, in a manner 

 similar to that employed in the preparation of pentabromorcin. It is, 

 however, advantageous to use considerably less water (about one fifth), 

 and to moderate the heat produced during the reaction by occasionally im- 

 mersing the bottle in cold water. Two or three crystallizations from carbon 

 disulphide serve to purify the product, which then forms large colourless 

 or faintly yellow prismatic crystals. The pure pentabromresorcin melts at 

 113°-5. It is almost insoluble in water, but readily soluble in ether and 

 alcohol, from the latter of which it is precipitated on the addition of water. 

 It is also moderately soluble in cold benzol and in hot petroleum-oil, from 

 which it crystallizes out in great part on cooling. Treated with hydriodic 

 acid it yields a colourless compound, crystallizing in needles, probably 

 tribromresorcin. 



Analysis of Pentabromresorcin. 



I. *382 grm. substance gave '712 grm. argentic bromide. 



II, *292 grm. substance gave *544 grm. argentic bromide. 



