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A new approach has been developed for the synthesis of 1-substituted 3 а ,6 а -diarylglycolurils from an imidazolone, imidazooxazolone, imidazooxazinone, or imidazooxazepinone and urea in the presence of hydrochloric acid. The structure of 1-ethyl-3 а ,6 а -diphenylglycoluril was confirmed by X-ray diffraction studies.
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Баранов et al. (2017) studied this question.
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