%i ^^""'im'm^mi^ti^tii^ on StyrdU, ^^'^ 



tni^'i^^^oi't'have commenced to become solid; by continuing 

 the distillation large crystals of benzoic acid collect in the 

 receiver. '■ ■« •-■■-' 



Action of JkmingStdphuric Acid on Styrole. '' 



On mixing fuming Nordhausen sulphuric acid with styrole, 

 a violent reaction takes place with the evolution of heat; the 

 oil becomes tenacious, and assumes a dark colour. The ad- 

 dition of water produces the separation of a brown resinous 

 niass. The fluid filtered from this substance gave, when 

 treated with an excess of carbonate of baryta, a soluble baryta 

 salt, which, however, could not be obtained in a crystalline 

 form. The physical properties of these products, probably 

 analogous to Mitscherlich's sulphobenzide and hyposulpho- 

 benzidic acid, are far from inviting to a nearer investigation. 



•It 

 Action of Bromine on Styrole. 



Bromostyrole. — By the addition of bromine to the volatile 

 oil of storax it becomes heated to boiling, and the evolution 

 of hydrobromic acid always takes place. The oil is by this 

 reaction completely transformed into a crystalline mass of a 

 peculiar odour. 



The formation of hydrobromic acid can be completely 

 avoided by placing the flask in water and adding the bromine 

 by drops. By waiting each time till the heat evolved has 

 been removed, the product obtained is uniform. 



The crystalline mass is insoluble in water, but communi- 

 cates to it a highly peculiar penetrating odour and taste, 

 which resemble a mixture of oil of citron and juniper. It is, 

 on the other hand, very soluble in alcohol and aether. We 

 have in vain endeavoured, by gentle evaporation of the sethe- 

 real solution, to obtain well-formed crystals. The boiling 

 saturated alcoholic solution on cooling deposits the compound 

 in the form of an oil, which covers the bottom of the vessel, 

 and not unfrequently remains long fluid under the tempera- 

 ture at which it solidifies, until shaken, when it becomes solid. 

 It fuses under boiling water. It is decomposed by an alco- 

 holic solution of potash, bromide of potassium, and another 

 compound containing bromine being formed. 



The products submitted to analysis were of different pre- 

 parations. Nos. I. and II. were formed directly by the treat- 

 ment of styrole with an excess of bromine. The somewhat 

 yellow substance was washed with spirits of wine till it ap- 

 peared white, and after solution in the same menstruum was 

 again precipitated by the addition of water, and washed with 

 the same fluid till all trace of hydrobromic acid, which forms 



