Abstract
In the 1920's, R. Robinson and C.K. Ingold controverted on principles of an electronic theory of organic reactions. They had been investigated how to theorize reactivity of many complicated organic reactions from different points of view―polar (Robinson, alternative polarity) and non polar (Ingold,free affinity).
Gradually they were conscious of necessity of new concepts (electron valence) for showing quantitative reactivity in this controversy on nitration reactions of nitrosobenzene and benzilamine etc. from 1924 to 1926.
The year,1926, was the turningpoint that they indicated new concepts of reactivity of organic reactions―the density of electron around atoms (Robinson) and the electronic strain around atoms(Ingold). So, they could publish the electronic theory of organic reactions in 1930's.
Consequently not only Robinson but also Ingold in this controversy played an important part for forming basic concepts and methods to quantiy their reactivities in the electronic theory of organic reactions.
