naproanilide
Herbicide
HRAC K3 WSSA 15; alkanamide (acetamide)
NOMENCLATURE
Common name naproanilide (JMAF)
IUPAC name 2-(2-naphthyloxy)-N-phenylpropionamide
Chemical Abstracts name 2-(2-naphthalenyloxy)-N-phenylpropanamide
CAS RN [52570-16-8] unstated stereochemistry Development codes MT-101 (Mitsui)
PHYSICAL CHEMISTRY
Mol. wt. 291.3 M.f. C19H17NO2 Form Whitish crystals. M.p. 128 ºC V.p. 2.8 ´ 10-6 mPa (20 °C) S.g./density 1.256 (25 ºC) Solubility In water 0.75 mg/l (27 ºC). In acetone 171, toluene 42, ethanol 17, benzene 46 (all in g/l, 27 ºC). Stability Dilute aqueous solutions slowly degraded by u.v. light; solid stable to light. F.p. 110 ºC
COMMERCIALISATION
History Herbicide reported by S. Fujisawa (Jpn. Pestic. Inf., 1981, No. 39, p. 19). Introduced by Mitsui Toatsu Chemicals, Inc. (now Mitsui Chemicals, Inc.). Manufacturers Mitsui
APPLICATIONS
Biochemistry The active principle is thought to be the corresponding carboxylic acid. Mode of action Selective herbicide, absorbed through stems and roots. Uses Controls annual and some perennial weeds, but not Echinochloa crus-galli, in paddy rice, at 2-3 kg/ha. Gives good control of young Sagittaria pygmaea. Phytotoxicity Phytotoxic to direct seeding rice at high dosages. Formulation types GR. Selected products: 'Uribest' (Mitsui)
ANALYSIS
Product and residue analysis by hplc (Gotoh, J. Pestic. Sci., 1977, (4), p. 2).
MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for rats >15 000, mice >20 000 mg/kg. Skin and eye Acute percutaneous LD50 for rats >3000, mice >5000 mg/kg. Toxicity class WHO (a.i.) IV (tech); EPA (formulation) IV
ECOTOXICOLOGY
Fish TLm (72 h) >100 ppm. Daphnia LC50 (6 h) 40 mg/l.
ENVIRONMENTAL FATE
Soil/Environment DT50 in soil 2-7 d.
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