66 On the Destructive Distillation of the Sulphobensolates. [Recess, 



weighed and treated with excess of pure solution of sulphurous acid, to 

 convert the combined bromine into hydrobromic acid. This is determined 

 as bromide of silver. By this method the following result was obtained : — 



•821 grm. substance gave 1-154 grm. argentic bromide. This gives 

 59*81 per cent, combined bromine. The formula C c H 4 SBr 2 requires 

 59'70 per cent, bromine. This substance is therefore analogous to the 

 corresponding ethylene compound discovered by Cams*. 



The sulphobromide crystallizes in black prisms, which slowly give off 

 bromine on exposure to dry air, and are rapidly decomposed by moisture 

 with evolution of hydrobromic acid. They^ are tolerably soluble in car- 

 bonic disulphide and tetrachloride. 



Phenyl-hyposulphurous Acid. 



Amongst the reactions which phenylic sulphide gave with various re- 

 agentsf, that with sulphuric acid was particularly interesting. On treating 

 pure sulphide of phenyl with an equal bulk of concentrated sulphuric acid, 

 the oil changed first to a fine red colour, and as the heat increased it became 

 purple, and ultimately dissolved, giving off traces of sulphurous acid. The 

 compound thus produced, when cold, was semifluid, and gradually absorbed 

 moisture from the air, becoming a semisolid crystalline paste. This was 

 dissolved in a large quantity of boiling water, neutralized with pure baric 

 carbonate, filtered from the insoluble sulphate, and the solution of phenyl- 

 hyposulphite of barium evaporated until a pellicle formed on the surface, 

 and then allowed to cool. 



The crusts which come out consist of microscopic crystals. These, after 

 one or two recrystallizations from boiling water, were dried at 100° and 

 submitted to analysis. 



•419 grm. substance gave '175 grm. baric sulphate. 

 •334 grm. substance gave *141 grm. baric sulphate. 

 •320 grm. substance gave -312 grm. carbonic anhydride and '075 grm. 

 water. 







Theory. 



I. 



II. III. 



c e 



= 72 



. . 26-13 





26-61 





= 7 



2-54 





2-61 



Ba 



= 68-5 . 



, . 24-85 



24-56 



24-82 



s 2 



= 64 



. 23*24 







o, 



= 64 



. 23-24 









275-5 



100-00 







These analyses agree tolerably well with the formula C 6 H 5 Ba S 2 3 , H 2 O, 

 which I propose to call baric phenyl -hyposulphite. I have prepared the 

 copper salt, which likewise forms crystalline crusts ; but neither the calcium 

 nor sodium salt crystallizes as well as the barium. 



* Ann. der Chem. imd Pharm. vol. cxxiv. p. 113. 

 t Free. Roy. Soe, vol. xiv. p, 354. 



