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Purification of crucic acid for laboratory use by low‐temperature crystallization from aqueous acetone, ethanol, and methanol has been investigated. Two crystallizations of technical grade commercial acid (76舑86%) from acetone‐water (5蝘1) provided products of 94舑98% purity, depending on the original composition; residual impurities were primarily C 20 monoene and C 22 saturated acids.
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Hagemann et al. (1962) studied this question.
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