BY MEANS OF CATALYSTS CHEIGHTON. 7 



a pure acid. The impure acids were twice recrystallised from 

 water at 60. In agreement with Fajans, the melting points of 

 the d- and 1- acids were 127 -128; while that of the 

 inactive acid was higher, 136 - 137 , from which it may be 

 concluded that the acid, prepared as above, is a racemic acid. 

 Analysis by titration with barium hydroxide solution and 

 phenolphthaleiii gave the following degrees of puritv: 

 d-acid 1 - acid in acid 



I 100,070 I 100,120 I 100,070 



II 100,110 II 99,880 II 100,100 



III 99,780 III 99,980 III 



Mean: 99,990 99,990 100,090 



The optical rotation of these camphor-carboxylic acids was 

 determined a.t 25 : 



3.7743 g. d- acid, dissolved to 25 ccm. in absolute alcohol, 

 gave a rotation of + 2 3. 02 in a 2.5 clem. tube. 



0.4302 g. 1- acid, dissolved to 10 cc. in absolute alcohol, 

 gave a rotation of -2. 6 3 in a 1 idem. tube. 



These rotations correspond to a specific rotation of 61. 1. 



The acid prepared from the inactive camphor was com- 

 pletely inactive. 



Besides -these tests of purity the affinity constant of the 

 d- and 1- acid was measured, and the results obtained at 

 25 are given below 1 : 



d- Camphor carboxylic 1 Caniphor-carboxylic 



acid. acid. 



Mol. Degree A o> = 374 Mol. Degree 



v lit. Cond. Diss. Cond. Diss. 



Ji 100}' 100k vlit. 100 Y. 100k 



31,32 26,56 7,10 0,0173 31,32 26,60 7,11 0,0174 



62,64 36,96 9,88 0,0173 62,64 37,65 10,07 0,0180 



93,97 44,92 12,01 0,0175 156,64 57,65 15,41 0,0174 



1 :>(,,(>! 57,63 15,41 0,0179 250,49 70,24 18,78 0,0173 



250,58 70,91 18,96 0,0177 814,35 117,21 31,34 0,0176 



Mean: 0,0175 Mean: 0,0175 



1 One half of the specific conductivity of the water was subtracted 

 from that obtained for the solution. In the case of the d- acid J.4X1 

 and in the case of the 1- acid \. 2.7 X 10-*. 



