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Synthesis of compounds 2a: 4-(1,2-propenoxide-3-yl) acetophenone, 3a: 4-(1,2-Propenoxide-3-yl)acetophenone(ethoxycarbonylhydrazone), 4a: 3-[4-(1,2,3-Thiadiazole-4-yl)phenoxy]-1,2-propenoxide.
Abbreviation: MCPBA, m-chloroperoxybenzoic acid.
