266 DE. HEEMANN KOPP ON THE EELATION BETTVEEN BOELINO-POINT 
Table XII. 
Boiling-point. 
Pelargonate of Methyl 
Chloride of Pelargonyl 
Nitrobenzoate of Methyl ... 
Chloride of Nitrobenzoyl ... 
Cuminate of Methyl 
Chloride of Cumyl 
Cinnamate of Methyl 
Chloride of Cinnamyl 
c.„h ,„04 
C, 3 H, 0 ,C 1 
C,H,(N 04)04 
C,4H4(N04) 0,C1 
C 22 Hi4 O 4 
C,„H„0,C1 
C2„H,„04 
C„H, 0,C1 
1 
Calculated, 188°. 
Cahours, 220 °. 
Chancel, 279°. 
Cahours, 265° — 268°. 
Calculated, 247°. 
Cahours, 258° — 260°. 
E. Kopp, 241°. 
Cahours, 262 °. , 
It is evident from the preceding Tables that phenyl-alcohol, acetate, oenanthylate, and 
caprylate of phenyl boil at a temperature 116° higher than the con-esponding ethyl-com- 
pounds (phenyl contains 8C more than ethyl, 8 X 14°‘5 = 116°). The same difference is not 
observed in all corresponding phenyl- and ethyl-compounds, yet it occurs in cases other 
than those already mentioned, or which may be readily inferred from the regularities pre- 
viously alluded to. Thus the boiling-point of iodide of phenyl (Sceegham, 190°) is like- 
wise about 116° higher than that of iodide of ethyl (Piekee, 70°; x\adeews, 71°; Fe-VXK- 
LAN'D, 72°). It deserves also to be noticed that the boiling-points of acetate of phenyl 
(ScRUGHAM, 188°) and of iodide of phenyl (Sceugham, 190°) are as near to each other as 
those of acetate of ethyl (74°) and of iodide of ethyl (70°— 72°); and that the same 
difference is observed between the boiling-points of iodide of phenyl (190°) and of iodide 
of ethyl (70°^ — 72°) as between those of chloride of phenyl (Sceugham, 136°) and of 
chloride of ethyl (Pierre, 11°; Thenaed, 12°). 
The compounds of allyl contain 2 C more in their formulae than the coiTesponding 
ethyl-compounds. The difference in the boiling-points 2xl4°‘5 = 29° occurs not only 
in the compounds already quoted (the alcohols, acetates, butyrates, valerates, benzoates), 
but also approximately at least in the cyanates (cyanate of ethyl 60°, according to Wuetz; 
cyanate of allyl 82°, according to Cahours and Hofmana) ; in the iodides (iodide of ethyl 
70°, according to Pieeee ; 72°, according to Feanklaxd ; iodide of allyl 101°, according 
to Beethelot and Luca); in the ethyl-ethers (ordinary ethyl-ether, CgHijOj, 34°; allyl- 
ethyl-ether, CioHmO^, 62°‘5, according to Beethelot and Luca); and even in the alde- 
hydes (acetic aldehyde, C4 H4 Og, 20°, according to Kopp ; 22°, according to Liebig and 
to Pieeee ; acrolein, Cg H4 O^, about 52°, according to Eedtexbachee). But m the case 
also of corresponding ethyl and allyl compounds, the difference in the boiling-points is 
by no means altogether constant, as is apparent from a comparison of the boiling-points 
of sulphocyanide of ethyl (146°, according to Cahoues) and of sulphocyanide of allyl 
(143°, according to Dumas and Pelouze; 148°, according to Will; 151°, according to 
Kopp). 
If, on comparing the parallel terms of different series of compounds, we do not quite 
generally meet with the same difference in the boiling-points corresponding to the same 
