188 



RESEARCHES UPOISr THE CHEMICAL PROPERTIES OF GASES. 



TRIMETHTLENE. 



This hydrocarbon was prepared from trimethylene bromide by the action of zinc 

 (see p. 166). The gas was purified b}^ sulphuric acid and by digestion with dilute 

 potassium permanganate solution. 



1. Heactions in Solution. 



REAGENTS. KEACTIONS. 



Palladium chloride Reduced with extreme slowness. No carbon dioxide is 



formed. The reaction requires a much longer time 

 than in the case of the defines proper. 



Platinum chloride Unchanged, cold or at 100°. 



Gold chloride Unchanged, cold or at 100°. 



Silver nitrate Unchanged. 



Ammoniacal silver nitrate Unchanged. 



Iridium chloride Unchanged, cold or at 100°. 



Rhodium chloride Unchanged, cold or at 100°. 



Potassium rutheniate Traces of reduction after prolonged contact (reaction of 



the third class). 



Cerium dioxide dissolved in dilute sulphuric acid Unchanged. 



Potassium permanganate, neutral Unchanged. 



Potassium permanganate acidulated with dilute sul- Unchanged, 

 phuric acid. 



Potassium permanganate crystals in sulphuric acid,... Immediate oxidation to carbon dioxide. 



Chromic acid Unchanged. 



Ferric chloride Traces of reduction to ferrous chloride after twenty- 

 four hours (reaction of the third class). 



Bromine water Extremely slow absorption. 



Peroxide of hydrogen Unchanged. 



Potassium ferricyanide Unchanged. 



Calcium hypobromite in excess of lime water Unchanged. 



Iodine dissolved in potassium iodide solution Unchanged. 



Sulphuric acid, 1.8 specific gravity The gas is not absorbed in the cold. 



2. Reactions at High Temperatures. 



Iodic acid in crystals was reduced with formation of carbon dioxide at a tem- 

 perature closely approximating the temperature of dissociation of the acid. 



Comments. — The olefines are characterized by great stability towards oxidizing 

 influences at temperatures below 100°, so that carbon dioxide is not evolv'ed except 

 in the case of the action of potassium permanganate in concentrated sulphuric acid. 

 In several cases where destructive oxidation might be expected to occur, the olefines 

 are converted into glycols (e. (/., in the case of dilute potassium permanganate). 



Trimethylene yields reactions similar to those of the true olefines but is decid- 

 edly more stable towards many reagents. It does not reduce osmic acid, potassium 



