In this dissertation, the stable radical cation salts ofphenothiazine and 10 - alkylphenothiazine alky=〓(〓 hexachloroantimonate,perchlorate and iodide were prepared by one- electron oxidationwith 2,2,6,6-tetramethyl - 4 -acetyloxypiperidine oxoammoniumhexachloroantimonate, perchloric acid/hydrogen peroxide andmolecular iodine respectively, and they were characteried by UV -Vis spectroscopy and ESR spectroscopy.

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Object: A specific and sensitive liquid chromatography tandem mass spectrometry method was developed for the multiresidue determination of sulfisomidine, sulfapyridine, sulfamerazine, sulfamethoxazole, sulfisoxazole, sulfadiazine, sulfamethizole, sulfachlorpyridazine, sulfamethoxypyridazine, sulfadimethoxine, sulfamonomethoxine, sulfathiazole, sulfadoxine, sulfaquinoxaline, sulfanilamide, sulfaguanidine, sulfamoxole, sulfameter, sulfadimidine, sulfacetamide, sulfaphenazole, sulfanitran, sulfabenzamide and a potentiator, trimethoprim, in meat.

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Imino-1, 3-thiazetidines is the basic structure of a kind ofbioactive herbicide and insecticide. Our method has advantage in synthesis highly substituted2-imino-1, 3-thiazetidines, therefore it has practical value to some extent. We also researched the reactions catalyze by active zinc dust.

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5H-Thiazolo[3,2-a]pyrimidine can be efficiently prepared by the reaction of dihydropyrimidine-2-thione withα-bromoacetone,in water media.

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Phenothiazines were also oxidized byiodine and 2, 2, 6, 6- tetramethyl - 4 - acetyloxypiperidineoxoammonium hexachloroantimonate to radical cations in the cavityof β-cyclodextrins in aqueous solution.

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Piperidine oxoammonium salts oxidize aromatic amines and N, S-containing heterocycles to the corresponding radical cations, and the isotope effects in electron transfer reactions between thianthrene and N-methylphenothiazine radical cations and their respective neutral parent molecules have been reported for the first time.

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A general novel synthetic method to Symmetrically or unsymmetrically 2,3,6,7- substituted thieno[2,3-d:5,4-d\']dipyrimidine-4,5(3H,6H)-diones and 2-substituted benzothieno[3,2-d] pyrimidin-4(3H)-dione by utilizing aza-Wittig reaction was proposed firstly. This synthetic method has the advantage of easily accessible starting material, mild condition and good yields.

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The best of them were 4c and 8d which exhibited 87% and 89% inhibition of Penicilium digitatum . And benzothieno[3,2-d]imidazol[1,2-a]pyrimidin-2,5(1H, 3H)-diones or benzothieno[3,2-d][1,2,4]triazol[1,5-a]pyrimidin-10(3H)-one only exhibited moderate inhibition.

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And benzothieno[3,2-d]imidazol[1,2-a]pyrimidin-2,5(1H, 3H)-diones or benzothieno[3,2-d][1,2,4]triazol[1,5-a]pyrimidin-10(3H)-one only exhibited moderate inhibition.

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