Theory of Molecular Volumes. 

 Phellandrene, C 30 H 16 a and j3. 

 d 16 . 6 0-846 



447 



cL 5 . s 0-848 



B.P. 170. 



By means of formula with K = *52, we find, 

 Phellandrene « ... d BP 0-7162, V 190-0, SA.V 207*2, A-17'2 



. 



The formulae are 



B.P. 



CH 3 CH 3 

 \ / 



CH: 



I 



CH 

 / \ 



CH 2 CR 



0-7183, Y 189-3, SA.V 207-2, -17-9 



CH 3 CH 3 



\ / 



CH 



l 



CH 



/ \ 



CH, CH 



CH CH 



% / 



C 



I 



CH 3 



CH 2 CH 

 \ / 



C 



II 

 CH 2 



a Phellandrene. /} Phellandrene. 



The contractions accord well with the formulae, although 

 a little high. This shows that we must expect small differ- 

 ences in the volumes of the terpenes, and thus in the 

 contractions, just as we find among the boiling-points and 

 molecular refractions. 



The latter physical property is well adapted to showing 

 the number of the olefin linkings and the molecular volumes 

 of the ring structure of a compound. We can, however, 

 often deduce the former by knowing the latter. 



The Camphan Class of lerpenes. 



Fortunately we possess a knowledge of two compounds of 

 this class, viz. : — 



Camphor and Borneol. 



CH. CH CHo CH, - - CH - - CH 2 



I 

 CH 3 -C -CH 3 



CH 2 C CO 



l 

 CH 3 



Camphor, C l0 H 16 O. 



I 

 CH - C - CH 3 



I ' 



CH 2 C CH(OH) 



I 



CH~ 



Borneol, C 10 H 17 (OH). 



