( 723 ) 



c 



I am still engaged with this 

 geometrical isomerism and the 

 other substances described. I 

 soon hope to make a further 

 communication about the 

 alcohols formed from these 

 terpenes. 



Of late, after this research 

 had already been partly 

 finished, Sabatier and Sende- 

 RENS have made some valu- 

 able additions to our methods 

 of research of the unsaturated 

 compounds. I am engaged in 

 applying the same to the 

 aliphatic terpene group and to 

 the sesquiterpenes. Dihydro- 

 ocimene, which cannot be 

 further hydrogenised by so- 

 dium and alcohol, eagerly 

 absorbs hydrogen at 180^ 

 under the influence of reduced nickel; a nearly odourless liquid is 

 formed which boils at a considerably lower temperature and contaii>s 

 only traces of the original product. It consists, probably, of dimethyl- 

 2. 6. octane, the as yet unknown foundation of the aliphatic terpene 

 group. The aliphatic terpene-alcohol, geraniol, also reacts with nickel 

 and hydrogen; the reaction product is a liquid, possessing a particular 

 odour; it contains, besides some water, a hydrocarbon, which probably 

 is identical with the hydrocarbon, obtained from dihydroacimene 

 and a substance of a higher boiling point, which I suppose to be the 

 saturated alcohol, corresponding with geraniol. 



c 



Chemistry. — "On some allplinüc terpene alcohols." By Dr. C.J. 



Enklaar. (Communicated by Prof. P. van Romburgh). 



(Communicated in the meeting of January 27, 1906). 



According to the process of Bertram and Walbaum ') terpene 

 alcohols may be obtained from terpenes by digesting their solution 

 in glacial acetic acid for some hours with dilute sulphuric acid at 

 50^ — 6Ü^ The aliphatic terpene ocimene, discovered by van Romburgh 



1) D. R. Pat. No. 80711, Journ. f. Prakt. Cliem. 49. 1. Also compare Wallach 

 and Walker, Ann. 271, 285, and Power and Kleber, Pharm. Rundschau (_N.-York) 

 1895, No. 3. 



