Theory of Molecular Volumes, 



Benzene, CgH, M.V. 960 



Ethyl Benzene, C H 5 . C 2 H 3 1393 



Propyl Benzene, C G H 5 .C 3 H 7 162'1 



Cinnamene, C C H 5 . CH : CH., . 1319 



Cymene, C G H 4 CH, . C 3 H. . 184-9 



Anisol, 6 H g .O.OH 3 ... 1255 



Pbenetol, C a H 5 . O . C 2 H, . . . 1476 



443 



A 

 2A.Y.111-0 -150 

 154-6 -15-3 

 176-4 -14-3 

 1473 -15-4 

 199-6 -14-7 

 1406 -151 

 162-8 -15-2 



Mean -15-0 



Hexamethylene. 



CH 2 



/ \ 



CH, CH 2 



CH 2 CH, 



\ / 



CH„ 



The Hexamethylene Kino. 



M.V. Hexamethylene, 6 6 H 12 116*3 



V Hexylene, C 6 H 12 132*4 



A for Ring -1G-1 



CH 2 : CH . CH 2 . CH 2 . 0H 2 . CH 3 



Hexylene. 



This is a somewhat larger contraction than is common 

 with benzene derivatives, and it shows tbat there is a ten- 



dency for the aromatic nucleus in 



C Ho • H to extend 



its influence to the extra-hydrogens. If this were entirely 

 the case the volumes would be 115 2. 



When, however, another substituent of a hydrocarbon 

 character is introduced, the extra hydrogens partake of the 

 nature of paraffin derivatives, and the volumes increase to 

 4'0 units. 



Aromatic Derivative. Hydro-aromatic Derivative. 



M.V. 6xH M.V. 



Toluene. C G H. . CH a 118-3 23'8 142-1 Hexahydrotoluene, C 6 H n CH 3 



Xylene, C 6 H 4 .(CH S ) 2 ... 140-4 248 165-2 Hexahydroxylene, G H 10 (CH 3 ) 2 



Naphthalene, C, H S 1472 240 171'2 Naphthyl Hydride, C 10 H 1( 



Mei 



24-2=6x4-0 



We find that pipiridene C 5 H n N stands in exactly the same 

 relation to pyridene C 5 H 5 N, as hexamethylene C G H ]2 stand- 

 to benzene. 



Pyridene C 5 H 5 N. M.V. . 



GH= 6x3*2 . 



89-3 

 19-2 



2A.V 108-5 



Pipiridene C 5 H n N ... 108*8 (obs.] 



