268 
DE. HEEMANJi^ KOPP ON THE EELATION BETWEEN BOILING-POINT 
Table XVI. 
Hj O^: — Methyl-ether, Berthelot, — 21°. 
Ce Hg O3: — Methyl-ethyl-ether, Williamson, 11°. 
Cg Hjg O2 : — Ethyl-ether, Dumas and Boullay, Kopp, 34° ; Andrews, Delffs, 35°. 
CjjHj^Oj: — Methyl-amyl-ether, Williamson, 72°; ethyl-butyl-ether, Wnrtz, 78° — 80°. 
Ci4Hjg03: — Ethyl-amyl-ether, Williamson, 112°; Guthrie, 111° — 113°. 
CigHjgOg; — Butyl-ether, Wurtz, 100° — 104°? 
CjgHjgOj: — Amyl-ether, Gaultier, 170°; W’urtz, 170° — 175°; Eieckher, 175° — 183°. 
Still greater (amounting to about 30°) is the difference in the boiling-points corre- 
sponding to the elementary difference Cg Hg in the chlorides, bromides, and iodides of 
the alcohol radicals, The boiling-points of the methyl, ethyl, butyl, and amyl 
compounds are known with tolerable certainty. 
Table XVII. 
DifF. 
C. 
H3 
Cl 
C. 
H, 
Cl 
Ce 
Hg 
Cl 
C.o 
Cl 
C. 
Hg 
Br ... 
C. 
Hg 
Br ... 
Cs 
Hg 
Br ... 
Cxo 
Hu 
Br ... 
C. 
H3 
I 
C4 
Hg 
I 
Ca 
Hg 
I 
Cxo 
Hu 
I 
Diff. 
C3 H, 
2C3 h; 
c,h; 
Cg H, 
2C3H. 
C.H, 
Cg a 
2C3 a 
c, a 
Berthelot, — 20° 
Pierre, -fll° 
Wurtz (70°— 75°), 73° 
Pierre, Cahours, 102°. 
Pierre, 13° 
Pierre, 41° 
Wurtz, 89° 
Pierre, 119° 
Andrews, 42°; Pierre, 44° 
Pierre, 70°; Andrews, 71°; Frankland, 72° 
31 
.2x31 
. 29 
28 
.2x24 
30 
27 
.2 X 25 
28 
Similar remarks apply to the sulphides (CnHn+JaSz* 
Table XVIII. 
Diff. 
Diff. 
2C3a 
6C3H, 
c, a s, 
Ee^nault. 41° 
2x25 
6 x 21 
c„ a^s, 
Pierre, 91° 
P H ^ 
'^'20 -*^22 *^2 
Balard, 21 6° 
Also to the Mercaptans (C^ H„+i) H Sj. 
2C3H3 
c, a s, 
Liebig, 36° 
Cg H,„Sg 
Humann, 88° 
Cg Hg 
CloHjg Sg 
Krutzsch, 117°; Kopp, 120° 
2x26 
29-32 
On the contrary, the difference in the boiling-points is less than 19° in the anhydrous 
acids (anhydrides) C'„ II „_2 Oe. 
