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Products of the dimerization of unsaturated fatty acids iii. separation of dimeric fatty acids with the aid of gc and hplc identification of branched aliphatic dicarboxylic acids



Products of the dimerization of unsaturated fatty acids iii. separation of dimeric fatty acids with the aid of gc and hplc identification of branched aliphatic dicarboxylic acids



Fett Wissenschaft Technologie 92(4): 135-138



From dimers produced by dimerisation of pure oleic acid we obtain by freezing small amounts of compounds, which can be separated further by GC. The separated compounds are isomers with a molecular weight of 594. They are saturated branched aliphatic dicarboxylic acid esters. They are obviously produced by en-reaction followed by hydrogenation. A much more effective separation than by GC is possible by HPLC, using a detector based on light scattering. Thus the dimeric fatty esters can be separated into four fractions: the first fraction consists of aromatics, the second obviously of alicyclic and unsaturated dicarboxylic acids, the third and fourth consist of aliphatic dicarboxylic acid esters of MW 594. Fatty acids obtained by dimerisation of a starting material rich in linoleic acid contain large amounts of aromatic compounds, those which are obtained by dimerisation of starting material rich in oleic acid contain rather high amounts of aliphatic dicarboxylic acids and practically no aromatic compounds.

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