99 



pinacone : hydrole, wliicli are dependent on tlie group introduced. 



It is to be expected lliat these dilFei-ences will continue to exist 

 also in another medium provided this remains neutral, for instance 

 when we reduce with aluminium amalgam in another saturated 

 alcohol. This indeed proved to be the case : 



On the other hand it was ascertained that a ketone wdiich in a 

 neutral solution gave almost exclusively hydrole, yet yielded in a 

 feebly acid solution nothing else but pinacone. 



2 grams of pp' di-chlorobenzophenone yielding in a nentral 

 solntion with AlHg 96 \ of hydrole gave with zinc dust and the 

 acetic acid-alcohol mixtnre 1.99 grams of pure pinacone m. p. 180°. 



0.1820 and 0.1926 gram gave 0.2060 and 0.2207 gram AgCl 

 Calculated for C,,H,30,C1, 28.1 7„ CI (Found 28.0—27.7). 



This also agrees with the assumption that the formation of pinacone. 

 in the absence of OH-ions and in this method of reduction, takes 

 place very much more rapidly than that of other possible reduction 

 products and that the hydrole formation in a neutral medium must 

 be attributed to the presence of OH-ions at the boundary layer. 



The measurement of the velocity with which some pinacones are 

 converted into the mixture of ketone and hydrole will be the subject 



of a following communication. 



Delft, May 19J3. 



Lab. Organic Chemistry 

 Technical University-. 



Chemistry. — "Equi/ibria in ternary systems". VIII. By Prof. 



SCHREINEMAKERS. 



Let us now consider the case when a liquid L is saturated with 

 the solid compounds F and F' and at the same time in equilibrium 

 with a vapour G. As the system F ~\- F' -{- L -\- G contains the 

 three components in four phases it is monovariant ; hence we can 

 consider the vapour pressure of the system and the conq)()sition of 

 L and (J as functions of the temperature. 



7* 



