
TY  - JOUR
A1  - Molyneux, RJ 
A1  - Jurd, L 
T1  - The condensation of some phenols with malic acid, maleic acid and maleic anhydride
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1974
VL  - 27
IS  - 12
SP  - 2697
EP  - 2702
KW  - 
UR  - https://doi.org/10.1071/CH9742697 
N2  - Optimum yields of coumarins are obtained by Pechmann condensation of polyphenols with malic acid in the presence of sulphuric acid at 100- 120° in the absence of water. Under these conditions the Ponndorf reaction with maleic acid does not occur.    Pechmann condensation of pyrogallol with malic acid gives substantial quantities of the novel dicoumarin (2), while the condensation of resorcinol with maleic anhydride in the presence of zinc chloride yields the benzoyl dihydrocoumarin (5a). 
ER  -

