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各种芳环和芳杂环醛与含有活性亚甲基的化合物如丙二腈等于水中,以4mol%的磷酸氢二铵为催化剂,室温搅拌即刻析出固体,得缩合产物。20例收率70%～95%。
Various aromatic ring and heteroaromatic aldehyde and compounds containing active methylene such as malononitrile equal to water, with 4mol% of diammonium phosphate as catalyst, stirred at room temperature immediately precipitated the solid to give the condensation product. 20 cases of the yield of 70% to 95%.