

2,4-D and Related Compounds 
3-(2,4,5-Trichlorophenoxy) butyric acid [3-(2,4,5-TB)] 
3-(2,4,5-Trichlorophenoxy)butyric acid was metabolized to its 
acetic acid derivative in wheat but not in pea stems (75). 
4-(2,4,5-Trichlorophenoxy)butyric acid [4-(2,4,5-TB) ] 
This material was metabolized by aspergillus niger primarily to 
3-hydroxy-4-(2,4,5-trichlorophenoxy)butyric acid, which, when used as a 
substrate, gave only a trace of 2,4,5-trichlorophenoxyacetic acid (441). 
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