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Obtener el precio más reciente125/kg /
|Minimum Order
Place of Origin:
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Price for Minimum Order:
Minimum Order Quantity:
200kg
Packaging Detail:
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Delivery Time:
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Supplying Ability:
2000
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Persona de contacto Mr. David
868,zhenchen road, Baoshan district, Shanghai, Shanghai
Composition A mixture containing ?0% avermectin B1a (i) and ?0% avermectin B1b (ii). Mol. wt. **3.1 (avermectin B1a); **9.1 (avermectin B1b) ***** C*8H*2O*4 (avermectin B1a); C*7H*0O*4 (avermectin B1b) Form Colourless to pale yellow crystals. M.p. **1.****9.4 癈 (decomp.) V.p. <3.7 ?***3 mPa (*5 癈) KOW logP = 4.4?.3 (pH 7.2, room temperature) Henry 2.7 ?***3 Pa m3 mol*1 (*5 癈) *****/density 1.*8 (*2 癈) Solubility In water ***0 mg/l (*0 篊). In toluene **0, acetone **0, isopropanol *0, chloroform *5, ethanol *0, methanol *9.5, n-butanol *0, cyclohexane 6 (all in g/l, *1 篊). Stability Stable to hydrolysis in aqueous solutions at pH 5, 7, and 9 (*5 篊). Sensitive to stronger acid and base. U.V. irradiation causes conversion first to the 8, *-Z- isomer, then to unidentified decomposition products. Specific rotation [a]D*2 **5.7?(c=0.*7, CHCl3)
