Abstract: (E)-3-Alkenoic acids(Ⅰ) were synthesized by Knoevenagel reactions of aliphatic aldehydes with malonic acid in xylene under reflux.The effect of piperidine,pyridine and 4-dimethylaminopyridine(DMAP) as catalyst on the reaction was investigated.With piperidine as catalyst,yield of the product Ⅰ was the highest,around 70%,and the molar ratio of Ⅰ to the by product,α,β-unsaturated carboxylic acids(Ⅱ),was up to 12∶1.DMAP gave lower yield(about 60%) and slightly higher selectivity.Pyridine gave the poorest yield and selectivity that the molar ratio of Ⅰto Ⅱwas only 3∶1.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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