Carbendazim

Common name carbendazime

IUPAC name methyl benzimidazol-2-ylcarbamate 

Chemical Abstracts name methyl 1H-benzimidazol-2-ylcarbamate 

CAS RN [10605-21-7] 

Mol. wt. 191.2 

M.f. C9H9N3O2 

Form Crystalline powder. 

M.p. 302-307 篊 (decomp.) 

V.p. 0.09 mPa (20 篊); 0.15 mPa (25 篊); 1.3 mPa (50 篊); separate study gives <0.0001 mPa (20 篊) 

KOW logP = 1.38 (pH 5), 1.51 (pH 7), 1.49 (pH 9) 

Henry 3.6 ´ 10-3 Pa m3 mol-1 (calc.) 

S.g./density 1.45 (20 篊) 

Solubility In water 29 mg/l (pH 4), 8 mg/l (pH 7), 7 mg/l (pH 8) (24 篊). In dimethylformamide 5, acetone 0.3, ethanol 0.3, chloroform 0.1, ethyl acetate 0.135, dichloromethane 0.068, benzene 0.036, cyclohexane <0.01, diethyl ether <0.01, hexane 0.0005 (all in g/l, 24 篊).  Stability Decomposes at m.p.; stable for at least 2 y below 50 篊. Stable after 7 d at 20 000 lux. Slowly decomposed in alkaline solution (22 篊); DT50 >350 d (pH 5 and pH 7), 124 d (pH 9). Stable in acids, forming water-soluble salts.

Mode of action

Systemic fungicide with protective and curative action. Absorbed through the roots and green tissues, with translocation acropetally. Acts by inhibiting development of the germ tubes, the formation of appressoria, and the growth of mycelia.