Argentation chromatography with silver ion macroreticular ex‐change resin was applied to diterpene resin acids and methyl esters. Best results for diterpene acids were obtained with silver‐saturated ion exchange resin and solvent systems such as ethyl ether/acetone or acetone. The technique was applied in the isolation of a major component, identified as 20‐nor‐5,7,9‐abietatrien‐18‐oic acid, from a commercial disproportionated rosin.
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Curran et al. (1981) studied this question.
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