Products

 

FOMESAFEN

 

Herbicide: diphenyl ether
  

Common name fomesafen (BSI, draft E-ISO, ANSI);
IUPAC name 5-(2-chloro-a,a,a-trifluoro-p-tolyloxy)-N-methylsulfonyl-2-nitrobenzamide 
Chemical Abstracts name 5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamide 
CAS RN [72178-02-0]  EEC no. 276-439-9  Development codes PP021 (ICI) 
 PHYSICAL CHEMISTRY
fomesafen
Mol. wt. 438.8  M.f. C15H10ClF3N2O6S  Form White crystals.  M.p. 219 °C  V.p. <4 ´ 10-3 mPa (20 °C)  KOW logP = 2.9 (pH 1), <2.2 (pH 4-10)  Henry <2 ´ 10-7 Pa m3 mol-1 (pH 7, 20 °C)  S.g./density 1.61 (20 °C)  Solubility In pure water c. 50, <10 (pH 1-2), 10 000 (pH 9) (all in mg/l, 20 ºC).  Stability Stable in storage for at least 6 months at 50 ºC. Decomposed by light. Stable at pH 3 and 11 (40 °C). Stable to aqueous photolysis for 32 d (pH 7, 25 °C).  pKa 2.83 (20 ºC); forms water-soluble salts (e.g. fomesafen-sodium) 
 fomesafen-sodium: Mol. wt. 460.7  M.f. C15H9ClF3N2NaO6S 
  APPLICATIONS

Biochemistry Protoporphyrinogen oxidase inhibitor.  Mode of action Selective herbicide, absorbed by both leaves and roots, with very limited translocation in the phloem.  Uses Early post-emergence control of broad-leaved weeds in soya beans. Applied at 200-400 g/ha.  Phytotoxicity Non-phytotoxic to soya beans and to other crops such as beans of the genus Phaseolus and the leguminous cover crops Pueraria and Calapogonium.  Formulation types SL.