657 



concentration and the duration of the reaction may exert an 

 influence. 



In the motherliquor, from whicli the acid stryclinine salt of the 

 dextro-acid iiad deposited, there should still be present that of the 

 laevo-'dcid, this being more soluble. On addition of acetone a preci- 

 pitate was obtained which could be recrystallized from absolute 

 alcohol. Of course, it still contains a trifle of the less soluble salt 

 of the antipode, but yet in one of the preparations it was obtained 

 in a fairly pure condition. 



For the rotating power at t;=: 1.658 was found [«] = — 27°. 7 

 and [M] = — 135°. The concentration does not seem to exert a 

 great influence on the specific rotation, for, at c = 8.424 was found 

 [«] = — 27^.4 and [M] = — 134°. 



From this acid strychnine salt of the /-acid the neutral ammonium 

 salt was prepared. This gave for c — 3.113 the values [a] = + 7°.9 

 and [J/] = + 14°. 8. The neutral ammonium salt of the /-acid is 

 therefore, dextrorotatory . 



If (0 a solution of the ammonium salt is slowly added dilute 

 sulphuric acid, the dextrorotation diminishes, becomes zero and then 

 changes to a laevorotation, which Anally remains constant, as soon as 

 all the organic acid has been liberated. The rotation for the /-acid, 

 at c = 2.449, amounted to [a] == — 29°.8 and [M] = — 45°.8. 



Although we have not prepared the /-r?-sulphopropionic acid in a pure 

 and solid condition, it appears from the experiments in quite a 



a?-acid 



[A 



[M] 



/-acid 



M 



D 



[M] 



D 



s;-sulphopropionic acid C3H6O5S 

 acid potassium salt C3H5O5SK 

 acid barium salt (CsHaOsS)^ Ba 

 acid strychnine salt 



C3H605S.C2,H2202N2 



neutral ammonium salt 



C3H405S(NH4), 



neutral barium salt C3H405SBa 



