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Abamectin
Абамектин

See also The BioPesticide Manual, 2nd Ed.

Insecticide, acaricide

avermectin

 

NOMENCLATURE

Common nameabamectin (BSI, draft E-ISO, ANSI); abamectine ((f) draft F-ISO)

Абамектин PHYSICAL CHEMISTRY

CompositionA mixture containing ³80% avermectin B1a(i) and £20% avermectin B1b(ii).Mol. wt.873.1 (avermectin B1a); 860.1 (avermectin B1b)M.f.C48H72O14(avermectin B1a); C47H70O14(avermectin B1b)FormColourless to pale yellow crystals.M.p.161.8-169.4 °C (decomp.)V.p.<3.7 ´ 10-3mPa (25 °C)KOWlogP = 4.4?.3 (pH 7.2, room temperature)Henry2.7 ´ 10-3Pa m3mol-1(25 °C)S.g./density1.18 (22 °C)SolubilityIn water 7-10 mg/l (20 ºC). In toluene 350, acetone 100, isopropanol 70, chloroform 25, ethanol 20, methanol 19.5, n-butanol 10, cyclohexane 6 (all in g/l, 21 ºC).StabilityStable to hydrolysis in aqueous solutions at pH 5, 7, and 9 (25 ºC). Sensitive to stronger acid and base. U.V. irradiation causes conversion first to the 8,9-Z- isomer, then to unidentified decomposition products. Specific rotation[a]D22+55.7?(c = 0.87 in CHCl3)