ABSTRACT:A novel efficient redox system-potassium diperiodatoargentate [Ag(III)]-chitosan-was employed to initiate the graft copolymerization of methyl acrylate (MA) onto chitosan in aqueous alkali solution. The effects of reaction variables such as monomer concentration, initiator concentration, reaction time, and temperature were investigated and the grafting conditions were optimized. The structures and the thermal stability of chitosan and chitosan-g-PMA were characterized by infrared spectroscopy (IR) and thermogravimetric analysis (TGA). The solubility of chitosan-g-PMA in some mixed solvent was tested. The graft copolymer was shown to be an effective compatibilizer in blends of poly(vinyl chloride) (PVC) and chitosan. Finally, a mechanism is proposed to explain the formation of radicals and the initiation.
To find new strobilurin analogues with high activity against resistant pathogens, a series of (E)-α-(methoxyimino)benzeneacetate derivatives containing 1,2,4-triazole Schiff base side chain were designed and synthesized. Their structures were confirmed by IR,1H NMR, and13C NMR, ESI-HRMS, or elemental analyses. Bioassays indicated that most of the target compounds showed moderate to good fungicidal activities againstRhizoctonia solani,Botrytis cinerea Pers.,Fusarium graminearum,Cotton rhizoctoniosis, andBlumeria graminis. For example, compounds6gand6jexhibited promising antifungal activity againstRhizoctonia solani,Botrytis cinerea Pers.,andFusarium graminearum. Compounds6c,6l, and6mhad higher fungicidal activities againstBlumeria graminisat the concentration of 50 µg/mL; inhibitory rate is 91.41%, 92.13%, and 91.77%, respectively.
To find new 1,2,4-triazole derivatives which may possess significant biological activities, we synthesized a series of Schiff bases bearing 1,2,4-triazole ring derivatives. Their structures were confirmed by elemental analysis, IR, 1 H NMR. The biological activity tests showed that some of the target compounds showed certain fungicidal activities against against Gibberella zeae, Phytophthora infestans, Botrytis cinerea at dosages of 50 µg/mL.
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