413 



ive action, by (lie surrounding atoms or atom groups (Examples 

 CH„ CC1„ C.H^, CH,C1, CHCl,, etc., etc. — cf. also p. 22 'J. d. Ch. 

 ph.; also SnCl^, GeCl^, etc.). 



In double bonds, on the contrary, pai^t of the C-atom are left 

 free again, and is iOM «=1,55, exactly half^) of the normal value 

 3,1. In triple bonds the luliole C-atom can exert an attractive action 

 towards the outside, so that then 10M^f« = 3,l. 



Accordingly in the compound undei- consideration the value of 

 10* \/a is 1,55 greater for every C-atom with double bond, than 

 corresponding single bond. The amount of energy e, which contains 

 the term — "/„, will, therefore, be smaller by a proportional value. 

 WiBAUT (Ch. Weekblad N'. 24 of 17^'' June 1922, p. 259) really 

 states that the value of the energy of a double bond is from 10 

 to 20 cal. smaller than in a single bond. All this tinds its explana- 

 tion in the theory concerning y'a and b for all possible kinds of 

 compounds given by me in 1916, which theory has, unfortunately, 

 remained unnoticed by many up to now. 



I'avel sur Clarens (Suisse), Sept. — Oct. 1912. 



^) Thus e. g. in all aromatic compounds, in C0H4 etc. ; compare the table on 

 p. 20 J. de Ch. ph. 



