576 



Trans actions. — Physics . 



into two components by fractionally recrystalhzing from 

 benzine. 



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After seven recrystallizations tbe melting-point rose to 

 86°. The compound thus obtained was stearone (M.P. 88°), 

 which is produced by the decomposition of two molecules of 

 stearic acid : — 



2 C 18 H 36 2 = C 33 H 70 O + H 2 + CO, 



The stearone was identified by the preparation of the 

 oxime, which melted constantly at 62° (Kipping gives the 

 melting-point as 63°). 



The more soluble product left in the mother-liquor after 

 the stearine had been separated melted constantly at 72-3° 

 after several recrystallizations from benzene. This is evidently 

 the hydrocarbon C 35 H 72 (M.P. 74°) formed from the stearone 

 by reduction. 



Soon the amount of stearone in the distillate becomes so 

 great that the eutectic point is reached, and the melting-point 

 begins to rise. This explains the minimum melting-point at Z. 

 That this is the correct explanation was shown by the fact 

 that, on adding a little stearone to the products obtained 

 alter this minimum had been reached, in each case the 

 freezing-point was observed to rise. The addition of stearone 

 to the product obtained before the minimum, on the other 

 hand, caused a reduction in freezing-point. 



