Abstract
Abstract Aniline and N-ethylaniline were used as model compounds to study the effect of aromatic primary and secondary amines on maleate-fumarate isomerization. Amines were added to the copolymerization reaction of maleic anhydride and diethylene glycol at different degrees of conversion (P). The effect of amines on the relative amount of isomerization was followed with proton NMR. The efficiency of fumarate production decreases in the order P = 0.62 > 0.76 > 0.35 > 0. Mechanisms to account for the effect of aniline and N-ethylaniline on the maleate-fumarate isomerization are outlined.
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