10 Art 2.— y. Shi bâta and T. Maruki. : 



of obtaining a d-vaiiety of the optically active complex as the first 

 fraction, mesotomisation of diammine-dinitro-oxalo-eobalt complex 

 was next tried with cinchonine sulphate (Ci9H22NsO)2S04H2, which 

 is itself dextroi^Dtatory . 



The method of proceedure was quite the same as in the 

 previous cases. The cinchonine salt of the complex forms fine 

 pale brown needles which are anhydrous. The results of the 

 analysis were 



calc. for 

 obs. [Co(NH3),.(NO.A-CA]-H-(Ci^^N,0) 



Co= 10.04% Co = 10.40% 



H20= " H20= » 



At first» the cinchonine salt was separated in three fractions; 

 the first fraction consisted of the crystals obtained directly from the 

 solution, while the second and third fractions consisted of those 

 obtained by partial crystallisation in a vacuum. 



The three fractions had the following specific rotations: 

 I [«]g°=+88.5'' (0.2%, 10 cm) 



II [«]j?°=+8S° (0-25%, „ ) 



III [«]!,•'= -28-8° ( „ , „ ) 



The first two of these were then mixed together and recrystallised 

 from water. The least soluble portion of the crystals thus obtained 

 gave the value 



for its specific rotation, which remained unaltered even after further 

 recrystallisations. This fraction was then transformed into the 

 potassium salt. It had the following specific rotation: 

 [«]2p^»= + 111° (0-1 %, 10 cm) 



On account of tlie scantiness of the material, we were unable 

 to obtain, from the more soluble portions, the corresponding 

 /-variet}' of a sufficiently strong rotatory power. 



5) Optically Active Ammonium Diammine-di- 

 nitro-oxalo-cobaltiate. 



Optically active ammonium salts of this cobalt complex 



