Aluminium chloride, a new reagent for the condensation of β-ketonic esters with phenols
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The condensation of resacetophenone with several α-substituted acetoacetates with anhydrous aluminium chloride as condensing agent has been investigated. Ethyl α-methyl-, α-ethyl-, α-benzyl-acetoacetates undergo the condensation with the formation of 5-hydroxy-6-acetyl-3-alkyl-coumarin derivatives. Negative results were obtained with ethyl α-prophyl-, α-allyl, α-chloro-acetoacetates, the original ketone being recovered. The results obtained have been discussed.
KeywordsCoumarin Aluminium Chloride Phosphorus Oxychloride Ferric Chloride Solution Dimethyl Sulphate
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