
%0 Journal Article
%A Krajniak, ER 
%A Ritchie, E 
%A Taylor, WC 
%T Experiments on the synthesis of some coumarin derivatives
%J Australian Journal of Chemistry
%D 1973/04/01
%V 26
%N 4
%P 899-906
%K 
%R https://doi.org/10.1071/CH9730899
%U https://www.publish.csiro.au/paper/CH9730899 
%X Evidence has been obtained that the reaction between a phenol and maleic or fumaric acid in the presence of sulphuric acid to yield a coumarin derivative, the Ponndorf reaction, is a variant of the Pechmann reaction. The scopes of the two reactions appear to be similar.     Attempts to effect the oxidative cyclization of hydroxyaryl cinnamates to 4-arylcoumarins, a key step in Seshadri's scheme for the biogenesis of neoflavanoids, were unsuccessful. 4-Aryl-3,4- dihydrocoumarins, which are readily available, are smoothly converted into 4-arylcoumarins by iodine and potassium acetate in acetic acid. 
