Donnan — On the Reactivity of the Alkyl Iodides. 



199 



employed. This is well shown by comparing the above results 

 with those obtained in previous investigations. 



In the following table are given the relative reactivities of 

 some alkyl iodides as measured by the velocity of their 

 reaction with sodio-aceto-acetic ester in ethyl alcoholic solu- 

 tion. 1 



Table 3. — Wislicenus' Experiments. 



These figures show the eminent reactivity of methyl iodide as 

 compared with other saturated aliphatic iodides. Isopropyl iodide 

 is not distinguished by any special reactivity, and falls more or 

 less into line in the curve connecting reactivity with mass of the 

 alkyl group. The enormous reactivity of the unsaturated allyl 

 iodide^forms a striking feature of Wislicenus' results. 



In 1890 Menschutkin 2 investigated the velocity of combination 

 of the saturated aliphatic iodides with triethylamine in acetone 

 solution at 100°. The reaction 



EI + N(Et) 3 = NR(Et) 3 I 



was found to obey the bimolecular velocity-equation. The relative 

 reactivities, as measured by the velocity-coefficient, are given in 

 the subjoined table. 



1 Wislicenus, Lieb. Ann., 1882, vol. 212, p. 239. 



2 Zeitschrift fur Phys. Cheru., vol. 6, 1890, p. 41. 



Q2 



