Abstract
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.
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.
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.
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.
