— io8 — 
benzene-ring. Thus, the grouping = C(CH3)2, which also occurs 
in terpinolene, cannot be reduced into unsaturated benzene homologues 
(styrenes) nor in phenol ethers. If a hydrogen atom of the carbon atom 
of the side-chain linked to the benzene-ring is displaced by an alcohol 
radical, a reduction only occurs in the case of styrene-like hydrocarbons, 
whilst the corresponding phenol ethers undergo hardly any change. 
On the other hand, the vinyl and propenyl groups are always reduced 
readily. Klages further concludes that the reduction- capacity depends 
upon the position of the benzene-rest towards the double-linking, from 
the behaviour of the olefines, of which, for example, hexadecylene 
only attaches hydrogen to one of the double-linked carbon atoms 
after the entrance of a phenyl-group. 
In view of the well-marked difference between the otherwise closely- 
allied styrenes and phenol ethers, Semmler's conclusion cannot be 
maintained in its entirety. In connection with these observations 
Klages supplies experimental proofs of the facility with which various 
vinyl phenol ethers of the o-, m- and p-series can be reduced. 
Pin en e. In continuation of our Report^) on the publication by 
Gray, Henderson and Smith dealing with oxidation of pinene with 
chromyl chloride, we may add that the authors have meanwhile made 
a detailed communication on the same subject 2). The formula of 
the ketone which occurs in the oxidation is not CqH^^O, as ment- 
ioned in the first work, but C|qHj^4 0. 
Camphene. With regard to the mercury compound formed with 
mercuric acetate, see page loi. 
Sesquiterpenes. O. Schreiner^) continues in a number of 
essays his monographs of the sesquiterpenes. He deals especially in 
detail with caryophyllene , its history, occurrence, and physical and 
chemical constants, and in addition discusses cedrene, clovene, coni- 
mene, cubebene, galipene, guajene, gurjunene, heveene, humulene, 
and ledene. \ -. 
Alcohols. 
Nerol. H. v. Soden and W. Treff^) have made some further 
communications with regard to nerol, the geraniol-like alcohol dis- 
covered by Hesse and Zeitschel^) in neroli oil. They declare that 
1) Report October 1903, 85. 
2) Journ. Chem. Soc. 83 (1903), 1299. 
8) Pharm. Arch. 6 (1903), 103, 116, 129. Pharm. Rev. 22, 2 (1904), 60. 
^) Chemiker-Zeitung 27 (1903), 897. 
^) Journ. fiir praktische Chemie II. 66 (1902), 481. Report April 1903, 54. 
