262 DE. HERMANN KOPP ON THE RELATION BETAVEEN BOILING-POINT 
it must be borne in mind that the observations of boiling-points comprised in the higher 
ranges of the thermometer are frequently less accurate. 
Table V. 
Alcohols Cn Hjn Oj. 
Calculatei 
Observed boiling-point. j 
1 
Allyl-alcohol 
Ce H3 O2 
107 
Cahours and Hofmann, 103°. ! 
Phenyl-alcohol 
194 
Laurent, 187° — 188°; Kopp, 188°. j 
Benzyl-alcohol 
213 
Cannizzaro, 204°; Kopp, 207°. ! 
Thymyl-alcohol 
270 
Kraut, 243°. 
Styryl-alcohol 
261 
Wolff, 250°; E. Kopp, 254°. 
Table VI. 
Acids Cn Hm 
04- 
Calculated. 
Angelic acid 
C.oH« 0, 
185 
Pyroterebic acid 
204 
Benzoic acid 
CuHe 0, 
253 
Terebenthilic acid 
VeH^oO, 
262 
Cinnamic acid 
301 
Toluic acid 
VsH, 0, 
272 
Observed boiling-point. 
Meyer and Zenner, IQO'^; Reinsch, 191°. 
Rabourdin, 200°; Chautard, 210°. 
Kopp, 250°. 
Personne, 250°. 
Dumas and Peligot, 293°; E. Kopp, 300° — 304°. 
Strecker and Moller, 266°. 
Table VII. 
Compound ethers CnHmO^. 
Calculated. 
Observed boiling-point. 
Acetate of Allyl 
103 
Cahours and Hofmann, 98° — 100°; Zinin, 105°. , 
Cahours and Hofmann, 140°; Berthelot, about 145°. 
Butyrate of Allyl 
C,. H,„ 0. 
141 
Valerate of Allyl 
160 
Cahours and Hofmann, l62°. 
Acetate of Phenyl 
Scrugham, 188°. 
Dumas and Peligot, Kopp, 199°- 
Delffs, 207 °; Dumas and Boullay, 209 °; Kopp, 213°; 
Cannizzaro, 210°. 
Benzoate of Methyl 
1 Cjg Hg 0 ^ 
190 1 
Benzoate of Ethyl 
209 1 
Acetate of Benzyl 
Toluate of Ethyl 
C„„ H.„0, 
228 
266 
Noad, 228°. 
Cuminate of Ethyl 
^^20 12 ^ 4 , 
Gerhardt and Cahours, 240°. 
Rieckher, 252° — 254°; Kopp, 26 l°. 
Cahours, 275°— 280°. 
Berthelot and Luca, 230°; Zinin, 242°. 
Benzoate of Amyl 
Qinanthylate of Phenyl 
Benzoate of Allyl 
285 
Cinnarnate of Methyl 
1 CjQ Hjg 0 ^ 
238 1 
E. Kopp, 241°. 
Marchand, 260 °; E. Kopp, 262 °; H. Kopp, 266 °. 
Cannizzaro, 345°. ' 
Cinnamate of Ethyl 
C,, 0 , 
257 
Benzoate of Benzyl 
^22 12 ^4 
C-Q 0 , 
344 
Caprylate of Phenyl 
^28 12 ^4 
C . H „ 0, 
304 
Cahours, about 300°. j 
^^28 20 ^4 
In all the series of analogous combinations quoted in the previous Tables, a compoimd 
containing in its formula x C 2 more than another is found to boil at a temperatme 
d^xI9° higher. The same regularity obtains in other series of analogous compounds, 
but by no means in all. A few other groups may also be mentioned here, in which the 
observed boiling-points exhibit the above regularity, at all events udthin the limits of 
uncertainty usual in boiling-point determinations. The column containing the boiluig- 
points calculated by means of the given rule is headed by the word “ assumed.” 
