Abstract
Studies on two dithiocarbamates showed that they undergo UV photolysis and photo- oxidation and visible light photosensitized oxidation. A variety of products were identified including hydrogen sulfide, sulfur, sulfur dioxide, sulfate ion, carbon disulfide, amines, hydrazines, thioamides and thioureas. Reaction schemes involving radical intermediates, derived from CS, SS and SH bond cleavages, are suggested. Three commercial fungicides, Captan, Captafol and Folpet were also found to undergo UV photolysis and photo-oxidation and visible light photosensitized oxidation. Products were: imides, sulfur, sulfur dioxide; carbon dioxide, hydrogen chloride. Common mechanisms of photochemical change are discussed for these fungicides.
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