Ethylenediammonium diacetate EDDA

Soman and Patel reported the reaction of an extended hydroxychromenone 78 with aryl aldehydes 79 and 2-methoxypropene 80 in the presence of a catalytic amonnt of ethylenediammonium diacetate (EDDA) to provide an intermediate 81 for the synthesis of new furowarfarins (Scheme 13.23) [40]. The reaction is conducted in dry 1,4-dioxane at 85-90 °C in a screw-cap pressure tube. 

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