Abstract Green synthesis of 3-(1-naphthyl), 4-methyl-3-(1-naphthyl) coumarins and 3-phenylcoumarins has been carried out in one step by reacting 2-hydroxybenzaldehydes and 2-hydroxyacetophenones with 1-naphthylacetic anhydride and phenylacetic anhydride, respectively, using dual-frequency ultrasonication, i.e. ultrasonic bath of 40 kHz and probe of 20 kHz. The compounds were obtained in very high yield (80–90%) and their structures were confirmed by infrared and nuclear magnetic resonance data.

中文翻译：

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使用双频超声处理绿色合成 3-(1-naphthyl)、4-methyl-3-(1-naphthyl) 香豆素和 3-苯基香豆素

摘要 2-羟基苯甲醛和2-羟基苯乙酮与1-萘基乙酸酐和3-(1-萘基)香豆素、4-甲基-3-(1-萘基)香豆素和3-苯基香豆素一步法绿色合成。苯乙酸酐分别使用双频超声处理，即40 kHz的超声浴和20 kHz的探头。这些化合物以非常高的产率（80-90%）获得，其结构通过红外和核磁共振数据得到证实。