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Reaction of N-isocyaniminotriphenylphosphorane with biacetyl in the presence of a carboxylic acid in water proceeds smoothly at RT (20–26°C) and neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction proceeds smoothly and clearly under mild conditions and no side reactions were observed.
This work is funded by 2015 Yeungnam University Research Grant.
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