— 90 — 
In his opinion the formation of the various oxidation-products of 
camphene, viz., camphoric acid and apocamphoric acid, camphenilone, etc., 
can be quite well explained by this formula. Especially the formula 
of camphenilone, which would therefore be as follows: 
I-LC 
CH 
would give expression to the fact that this body is a low homologue 
of camphor. The reactions which lead to the formation of the hydro- 
carbon CgH^^ from camphenilone: 
CCH, 
CH 
CH 
correspond to those which occur during the conversion of camphor 
into camphene. If this supposition is correct, camphenilone should in 
an anologous manner be capable of conversion into a further low homo- 
logue of camphor. 
Kondakow^) deals in a long treatise with the syntheses in the 
hydroaromatic series, which occur under the action of zinc chloride. 
Many years ago he found already that ethylene hydrocarbons with 
a tertiary carbon atom in the double linkage, in the presence of zinc 
chloride absorb organic acids, and therewith yield esters of tertiary 
alcohols; tertiary alkyl haloids are also absorbed under the same 
conditions, forming haloid anhydrides of tertiary alcohols of a fairly 
complicated composition. This result induced the author to apply 
this reaction also to hydroaromatic unsaturated hydrocarbons, and 
that not only to those which contain the double linkage in the 
nucleus, but also those which contain it in the side-chain, on the 
supposition that zinc chloride could be used for the identification of 
^) Journ. f. prakt. Chem. 11. 65 (1902), 201. 
