Theory of Molecular Volumes. 457 



An interesting series of compounds is the following : — 



Compound. M.V. 2 A.V. A for E. K. 



Methyl Oxalate, C 4 H 6 4 ... 117'6 117*8 



CO— O-CH, 



I 



€0 — 0-CH 3 



Furfurane, C 4 H 4 73*2 85*1 -11-9 



CH = CH 



X [Oxide] 

 CH==CH / 



Furfurol, C 5 H 4 2 95*7 107-3 -11-6 



CH=C— CHO 



I > 



OB— CH 



Butyrolactone, C 4 H 6 2 ... [90-7] 103*6 -12*9 -48 

 CH,— CIL> 



i > 



CH 2 — CO 



[Lactone] 



Succinic Anhydride No data. 



Citraconic Anhydride. 



CH 3 — CH— CO 



\ 



,° 



CH— CO 



[Anhydride] [106*0] 118*4 -12*4 



The volume of .0 = 7*4 as in methyl oxalate. 



These results serve to show that although the compounds 

 may change considerably in chemical character, the con- 

 tractions are similar if they possess rings of similar nature. 



