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By employing an N-heterocyclic carbene as a catalyst, the tautomerization of 5-alkylidene-2-oxazolidinone proceeded to afford the corresponding 2-oxazolone. Among N-heterocyclic carbenes, 1,3-di-tert-butylimidazol-2-ylidene was the most effective catalyst for the tautomerization of 5-alkylidene-2-oxazolidinone.
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Fujita et al. (2015) studied this question.
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