— ii4 — 



of the isomeric thujenes by accepting two stereo-isomeric thujyl alcohols, 

 or xanthogene derivatives of these alcohols. Having regard to the 

 acids obtained by Kondakow and Skworzow on oxidation of the 

 isomeric thujenes, Tschugaeff points out that these results can be 

 explained in the most natural manner by means of the constitutional 

 formula drawn up by him for a- and /}-thujone. He has further 

 produced from thujamenthol an optically inactive hydrocarbon C 10 H 18 , 

 of the following physical constants: d^ 0,8046, n D20° I >4459 1 > boiling 

 point 157 to 159 (750 mm, pressure). From these constants Tschu- 

 gaeff concludes that this body may possibly contain a pentamethyl- 

 ene ring, and that therefore the following constitutional formula may 

 belong to it: CH 



CH 3 



CH 3 — HC 

 >CH — HC 



CH 

 CH, 



A crystalline nitrosochloride was obtained. The examination is to be 

 continued. 



With reference to the passage contained in Tschugaeff's above 

 work, that he was the first to call attention to the formation of 

 isomeric thujenes from thujyl xanthogenates, and that Kondakow 

 had confirmed his results, the latter 1 ) publishes a correction. He 

 emphasises that he had first of all, and repeatedly, stated, that thujene 

 and other hydrocarbons which are produced by means of the xantho- 

 genate method, are not uniform, whilst Tschugaeff had always laid 

 stress on their uniform character. If Tschugaeff now also stated 

 that the thujene from the uniform thujyl xanthogenate was not uniform, 

 this would be owing to the fact that he was compelled to do so by 

 the force of the arguments brought forward by his opponents. For 

 this reason the claims to priority made by Tschugaeff were not 

 justified. 



Menthene. A few years ago we reported on Tschugaeff's 2 ) 

 method of producing hydrocarbons from xanthogene derivatives of 

 terpene alcohols. Tschugaeff 3 ) now has been able to produce and 

 compare a number of menthenes from a whole series of such deriv- 



*) Journ. f. prakt. Chem. II. 69 (1904), 560. 



2 ) Report April 1900, 53 and October 1902, 95. 



3 ) Journ. russ. phys.-chem. Ges. 35 (1904), 11 16. According to Chem. Centralbl. 

 1904, I, 1347. 



