288 



PARETHYLMETHYLBENZENE, ETC. 



amidopseudocumene, C 9 H 10 (I^0 2 ).OT1 2 . Golden-yellow, 

 shiny needles ; fusing point, 137. 



b. Parethylmethylbenzene (Ethyltoluene). 

 C a H4 fCIP 



L \ CH 2 .CH 3 . 



Is obtained, like ethylbenzene, from a mixture of 

 parabromtoluene and ethyl iodide. Boiling point, 

 159. Yields the same products as paraxylene when 



oxidized. 



c. Propylbenzene (Cumene). 

 C 6 H 5 .C 3 H 7 . 



Is obtained by distilling cuminic acid with lime. 

 Colorless liquid ; boiling at 151. Under the influence 

 of oxidizing agents it is converted into benzoic acid. 



By the decomposition of a mixture of monobrom- 

 benzene and normal propyl bromide with sodium, a 

 hydrocarbon is obtained that is very similar to cumene, 

 but has the boiling point 157. Cumene is perhaps 

 isopropylbenzene. 



5. Hydrocarbons, C IO H 14 . 



a. Tetramethylbenzene (Durene). 

 C 6 IP(CH 3 ) 4 . 



Is produced by decomposing a mixture of monobrom- 

 pseudocumene and methyl iodide with sodium. Color 

 less crystals, easily soluble in alcohol ; fusing point 

 79-80 ; boiling point, 189-191. When oxidized with 

 dilute nitric acid, it yields cumylic acid and cumidinic 

 acid. 



b. Ethyldimethylbenzene (Ethylxylene). 

 &amp;gt;H 3 1 C2Ip 



Is obtained, like the preceding compound, from bromxy 

 lene and ethyl bromide. Colorless liquid ; boiling point, 

 183184. 



