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186ChemInform Abstract Contradictory statements are found in the literature about the preparation of 5-arylfurfurals. Hence, the formations of these compounds are re-examined. It is found that the reactions between furfural (I) and the aryldiazonium chlorides (II) yield the desired 5-aryl derivatives (IIIa)-(IIIe). The yields are influenced by the character of the substituents of the aromatic moiety of the aryl compounds (II). If the substituents are electron donors, the best yields are obtained in the presence of CuCl2 at 15-25 rc C and pH 4-6 and ith electron acceptors the highest yields are attained at 5-12 rc C, pH 1-2 in the presence of CuCl2. The catalyst FeCl2 gives enhanced yields of (III) below 0 rc C. The Knoevenagel reaction of e.g. (IIIa) with malonic acid (IV) yields the 3-(5-aryl-2-furyl)acrylic acids (V). he compounds (III) and (V) are of potential interest due to their biological activity. The compound (IIIb) has been studied by X-ray analysis: space group Pccn; Z = 8.

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