Ethylenediaminetetraacetic Acid → Ferrous picrate

Participants

Reaction Steps

According to one method aspect of the present invention, additives may be prepared by the steps of (i) combining EDTA and amine in a suitable solvent such as methanol; (ii) adding picric acid to a suitable solvent such as methanol to make a solution of picric acid; (iii) adding a source of +2 iron to the picric acid solution of step (ii) with stirring to obtain a green iron picrate solution; and (iv) adding portions of the solution of step (i) to the green iron picrate solution of step (iii) with agitation until the green color disappears and a clear yellow solution is obtained. The color change of step (iv) is rapid, taking place immediately upon sufficient addition of the solution of step (i).

Provenance & Evidence