116 ETHYLENE SERIES. 



gaseous at 40. It is but slightly absorbed by 

 water, more easily by alcohol (12 volumes). It con 

 ducts itself like ethylene, and combines, like this gas, 

 directly with chlorine, bromine, and iodine. It com 

 bines with hydriodic acid, forming isopropyl iodide. 

 By agitating it with concentrated sulphuric acid, a 

 sulpho-acid is formed, which, when distilled with water, 

 yields isopropyl alcohol. 



Propylene chloride, C 3 H 6 C1 2 = CH 3 .CHC1.CH 2 C1 

 (isomeric with methylchloracetol, p. 110), is also pro 

 duced by the action of chlorine on propyl hydride. 

 Colorless liquid, boiling at 93-98. 



Monochlorpropylene, C 3 H 5 C1 = CH 3 .CC1:CH 2 . Is 



produced from propylene chloride, and also from the 

 isomeric methylchloracetol by the action of alcoholic 

 potassa. Liquid, boiling at 23. 



Propylene bromide, C 3 H 6 Br 2 . Is also obtained 

 by allowing bromine to act upon isopropyl bromide ; 

 and, together with the following compound, by the 

 action of hydrobromic acid on allyl alcohol. Colorless 

 liquid, boiling at 142. 



Trimethylene bromide, C 3 H 6 Br 2 = CHXBr.CH 2 . 

 CH 2 Br. A liquid, boiling at 160-163: specific suavity, 

 2.0177 at 0. 



Monobrompropylene, C 3 H 5 Br. Liquid; boils at 

 56.5. 



3. Butylenes. 

 C 4 H 8 . 



There are three butylenes of different constitution 

 known. 



1. Butvlene (Methylallyl), CH 3 .CH 2 .CH:CH 2 . Is 

 obtained by decomposing a mixture of allyl iodide and 

 methyl iodide with sodium. Colorless liquid, boiling 



