138 LIFE: ITS NATURE AND ORIGIN 



Note: The charcoal was purified Norit. Alumina I was prepared through sodium 

 aluminate; alumina II, III, and IV, by hydrolyzing alumina isopropoxide by three 

 different procedures. 



The authors remark that nickel on alumina and on kieselguhr are better catalysts 

 for the dehydrogenation of substituted cyclohexanols than is platinum, because 

 they show less tendency to induce condensations. Nickel on chromium was the most 

 active catalyst in the case of resistant saturated hydrocarbons. In all, 28 representa- 

 tive compounds, including hydrocarbon alcohols, ketones, and ethers, were heated 

 at 300° to 350° in the liquid phase under nitrogen, in the presence of the catalyst 

 and also of benzene, which serves as a hydrogen acceptor or oxidizing agent. 

 (J.A.C.S., 1941). 



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