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0011839283
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note
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6k Peng and Deng reported that no desirable product was detected when a mixture of benzaldehyde, ethyl acetate, and urea (mol ratio 1:1:1.5) was heated at 100 °C for 30 min in the absence of ionic liquid, indicating a catalyst must be needed for the Biginelli reaction. However, when we found a very efficient reaction in neat without solvent and catalyst under similar reaction conditions, we communicated our observation to Professor Deng for his comments. We have not yet received a reply.
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0011833668
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note
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6a 202-204 °C). A portion of it was recrystallized from hot ethanol to give analytically pure sample.
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