108 



TORREYA 



TABLE 4. Variation in Activity According to the Position of Chloro and Methyl 



Substituted Groups 





Substances 



Cell 

 elongation 



Formative 

 effects 



CHoCOOH 







o 



1 









/\C1 









\ / 



2,4-Dichlorophenoxyacetic acid 



Active 



Active 



CI 









CH3CHCOOH 

















/\ci 









CI 



a — 2,4-Dichlorophenoxy ) propionic 

 acid 



Active 



Inactive 



CH3CH2CHCOOH 

 o 



/\C1 



a- (2,4-DichIorophenoxy) -n-butyric Active 

 acid 



CI 



Inactive 



CH2COOH 



O 



I 

 ACHs 



J 2,4-Dimethylphenoxyacetic acid Active 



CH3 



Active 



CH3CHCOOH 



O 



I 

 /\CH3 



a — ( 2,4-Dimethylphenoxy ) propionic Active 

 acid 



CHs 



Active 



CH3CH2CHCOOH 



I 

 O 



1 

 /\CH3 



a — (2,4-Dimethylphenoxy) -n-butyric Active 

 acid 



Active 



CH3 



