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  • Title: Synthesis and biological activity of organotin 4-methyl-1,2,3-thiadiazole-5-carboxylates and benzo[1,2,3]thiadiazole-7-carboxylates.
    Author: Wang ZH, Guo YZ, Zhang J, Ma L, Song HB, Fan ZJ.
    Journal: J Agric Food Chem; 2010 Mar 10; 58(5):2715-9. PubMed ID: 20014765.
    Abstract:
    A series of organotin 4-methyl-1,2,3-thiadiazole-5-carboxylates and benzo[1,2,3]thiadiazole-7-carboxylates have been synthesized and characterized by NMR ((1)H, (13)C, and (119)Sn), IR, and elemental analyses. The structure of the dimeric complex {[(BTHCO(2))SnEt(2)](2)O}(2) (BTH represents benzo[1,2,3]thiadiazol-7-yl) has been further confirmed by X-ray diffraction crystallography. Assessment for fungicidal activity indicates that all of the newly synthesized compounds exhibit good growth inhibition against Alternaria solani , Cercospora arachidicola , Gibberella zeae , Physalospora piricola , and Botrytis cinerea . High growth inhibition percentage at 50 microg/mL was obtained in vitro in the case of triorganotin 4-methyl-1,2,3-thiadiazole-5-carboxylates and benzo[1,2,3]thiadiazole-7-carboxylates. The corresponding EC(50) values of these triorganotin carboxylates have been detected, and values of EC(50) as low as 0.12 microg/mL against P. piricola and 0.16 microg/mL against G. zeae, respectively, were observed for triethyltin benzo[1,2,3]thiadiazole-7-carboxylate.
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