310 



The following dates, obtained with a 0,07725 normal hydrochloric 

 acid-solution at 40 C, may give some idea of these differences: 



Reaction-constant 



k: 



l-bornyl-l-mandelate 81,2 



l-menthyl-l-mandelate 28,5 



(time in minutes) 



Reaction-constant : 



k: 



l-bornyl-d-mandelate 84,9 



l-menthyl-d-mandelate 35,6 



(time in minutes) 



The ratio of the velocities is here in both cases : 

 for the &owy/-ethers, -=1,046; 



for the menthyl-ethers, -~- = 1,250. 



If fumaric acid be transformed into the l-bornyl-eiher , and then 

 oxidized with potassium-permanganate in acetic acid-solution, a 

 laevogyratory bornyl-tartrate was obtained, from which an also laevo- 

 gyratory tartar ic acid was set free. Better results were again 

 obtained, when the acid ether of borneol, or the neutral ether of 

 menthol were used for this purpose; and it was also proved, that 

 in using the oppositely rotating borneol, an excess of the dextro- 

 gyratory tartar ic acid finally resulted. 



In a recent, highly interesting paper, Smirnoff 1 ) published 

 the results of an investigation on complex salts of the type: 



{ Pt(d-Propeme) 3 }X 4> { Pt(l-Propeme) 3 }X^, { C o(d-Propeme) 3 } X 3 , 



and { Co(l-Propeme) 3 } X 3 , 



in which the substitutes, therefore, were optically active u-propy- 

 lene-diamines. He demonstrated that only two, in stead of the 

 expected four series of isomeric salts were observed in each case; 

 that these salts could not be separated into optical antipodes, and 

 that the fission of the analoguous salts derived from the racemic 

 a-propylene-diamine, gave the same isomerides as were obtained 

 from the optically active bases. These facts prove, that with a 

 special configuration of the active u-propylene-diamine, only one 

 of the two possible, enantiomorphous configurations of the complex 

 ion seems to be compatible. The specific dissymmetry of the 

 substitutes directs, therefore, also here the synthesis of the spatial 

 complex into one special direction: a true partially-asymmetric 



1) A. P. Smirnoff, Helvet. Chim. Acta, 3, 177, (1920) ; L. Tsc hug a jef f 

 and W. Sokoloff, Ber. d. d. Chem. Ges., 40, 3464, (1907); 42, 57, (1909). 



