The literature has considered in detail the condensation reactions of aromatic aldehydes with 5H-furanones [1, 2]. Condensations of 5-substituted 3H-furanones have insufficient description jn the literature, and only relate to 5-aryl-and 5-methyl-3H-furan-2-ones [2, 3]; this is explained by the low availability of 5-alkyl-3H-furan-2-ones.On the basis of 4-oxoalkanoic acids, we obtained a series of 5-alkyl-3H-furan-2-ones, with the alkyl substituent from C3H 7 to C6H13, in yields up to 75% [4]. That allowed the study of their reaction with aldehydes of the benzene and furan series. All the indicated furanones (Ia-e) react by the crotonlc type of condensation at the position 3 of the heterocycle.The isolation of the 5-alkyl(aryl)-3-arylidene-3H-furan-2-ones (Ha-/) was accomplished in acetic anhydride in the presence of anhydrous sodium acetate. The synthesis of the compounds (II) is also possible by the treatment of 4-oxoalkanoic acids with the equimolecular amount of aldehydes in the presence of sodium acetate under conditions analogous to those described for the condensation of furanones.
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