高度不飽和酸に関する研究-5-
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Highly unsaturated fatty acids, carrying more than 4 nonconjugated double bonds, that were prepared from cuttle fish oils, changed their structure from non-conjugated polyene to conjugated polyene, that is, to cis-cis-trans conjugated triene structure, when heated at about 200°C under interruption of air and also to conjugated diene form, when heated at 250°C.<BR>The produced triene gave the absorption maxima at 266, 277 and 287.5mμ and changed easily their structure to conjugated diene form, when heated at more than 230°C, where by absorption maximum was recognized at 236mμ.<BR>The compounds that carry conjugated triene structure were monomeric and distillable at 155167°C/0.01mmHg and were easily isomerized to conjugated polyene by 21% KOH-glycol, whereas the conjugated diene bearing compounds were polymeric and were hardly isomerized by alkali.<BR>But when highly unsaturated fatty acids were heated under the condition of diluted solutions (mixed with microcrystallinewax), the produced conjugated diene and triene were both monomeric and distillable at 158165°C/0.01mmHg.
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関連論文
- 高度不飽和酸に関する研究-5-
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- Polyunsaturated Fatty Acids. IV.:Infrared Absorption Spectra and their Assignments of Polyunsaturated Fatty Acids