446 



Mr. Gervaise Le Bas on the 



The values of M.V. enclosed in square brackets [ ] have 

 been calculated by formula. 



Reduction Products of Cymene. 



W. 



Compound. 



Cyiuene, 

 Carvene, 

 Menthene, 



C 10 H 14 



C 10 H 1C (Terpene) 

 C 10 H 1S 



Hexabydrocymene, C 1 H 20 



M.V. 



£ A.V. 



A. 



1847 



199-8 



-151 



192 8 



207-2 



-14-4 



[200-8] 



214 6 



-13-8 



[208-3] 



2200 



-13-7 



The compounds just studied are : — 



CH 3 CH 3 



\ / 



CH 



I 



CH CH 



CH CH 



% / 



C 



I 



CH 3 



Cymene. 



CH 3 CH 2 



i 



CH 

 / \ 

 CH 2 CH 2 



CH 2 CH 



V 



I 

 CH 3 



CH3 CH3 



\ / 



CH 



A 



CH 2 CH 2 



CH 2 CH 



CH a 



CH 3 CH a 

 \ / 



CE 



M 



CH 2 CH 2 



1 f 



CH 2 CH 2 

 \ / 



CH 



I 

 CH 3 



Limonene. Carvomenthene. Hexahydrocyinene. 



The contractions for these compounds vary from 14-15. 

 The results show that the compounds all possess six-membered 

 rings. 



The Terpenes C 10 H 16 are a large class, and divide them- 

 selves chiefly into two groups, viz.: — 



The Menthan Group C 10 H 16 ... Single six-membered rings- 



e.g. Limonene. 



The Camplian Group C 10 H 16 ... Double or bridged rings: 



e. g. Camphene. 



So far as the first of these is concerned, the members 

 all contain a six-membered ring. 



Semmler in his Atherische Ole has collected many data 

 from which we quote. 



