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To reduce energy consumption and environmental pollution and improve the practical application value of abamectin B2, the 23-OH was reacted with pyridine formylhydrazide, benzene sulfonyl hydrazide, brominated benzoylhydrazide and hydrazide formate after oxidized to carbonyl. Six avermectin derivatives with hydrazide structure were designed and synthesized. New compounds were confirmed by HMRS and 1H NMR and were preliminarily tested its insecticidal and acaricidal activities against diamondback moth, aphid and vermilion leaf mites. The insecticidal activities of target compounds indicated that the mortality rates of avermectin B2a with m-bromobenzoyl hydrazine and isonicotinic hydrazine against diamondback moth at 1 μg/mL were 75% and 50%, respectively, which were significantly higher than those of benzene sulfonyl hydrazide and methoxy formyl hydrazine abamectin B2a derivatives, respectively. [ABSTRACT FROM AUTHOR]

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Chlorosulfonyl-containing naphthol azo compounds were prepared by reaction of the corresponding sodium sulfonate (C. I. Acid Orange 7) with thionyl chloride in the presence of a catalytic quantity of N,N-dimethylformamide and some different solvents. The yield and chemical selectivity of chlorosulfonyl-containing naphthol azo compounds are discussed according to the properties of different solvents. It was demonstrated that high selectivity and high yieldO 89%) were achieved by using benzene, toluene or thionyl chloride as solvent. Additionally, on account of unstable properties of sulfonyl chlorides in MS and 1H NMR analyses, a new analytical method using stable sulfonamide is put forward to testify the molecular structures of sulfonyl chlorides indirectly. [ABSTRACT FROM AUTHOR]