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- W2023519697 abstract "Imidazole-based carbohydrazides, i.e., 3-oxidoimidazole-4-carbohydrazides 1 and 2-[(imidazol-2-yl)sulfanyl]acetohydrazides 6, react with aryl isoselenocyanates 4 in MeOH at room temperature to give the corresponding selenosemicarbazides 5 and 7, respectively, in good yields. On heating 7b in DMF in the presence of air to 100°, 1,3,4-oxadiazole 8a was formed via cyclization and formal elimination of H2Se. Product 8a was also obtained after heating of a mixture of 4a and 6b under the same conditions. On the other hand, on heating of a solution of 7c in MeOH at reflux, a cyclization occurred to give the corresponding 1,2,4-triazole-3-selone 9b. Again, the same product was formed when a mixture of 4b and 6b was heated in MeOH. Surprisingly, analogous cyclizations of selenosemicarbazides of type 5 under the same conditions failed, and only decomposition was observed. The structures of 7a, 7d, and 9b have been established by X-ray crystallography." @default.
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- W2023519697 date "2013-03-01" @default.
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- W2023519697 title "New Selenosemicarbazides Derived from Imidazole-Based Carbohydrazides" @default.
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- W2023519697 doi "https://doi.org/10.1002/hlca.201200620" @default.
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