O

FIGURE 5.5 Some lipid-derived components of essential oils.

Arachidonic acid (22) is a polyunsaturated fatty acid that plays a special role as a synthetic intermediate in plants and animals (Mann et al., 1994). As shown in Figure 5.6, allylic oxidation at the 11th carbon of the chain leads to the hydroperoxide (23). Further oxidation (at the 15th carbon) with two concomitant cyclization reactions gives the cyclic peroxide (24). This is a key intermediate for the biosynthesis of prostaglandins such as 6-ketoprostaglandin F1a (25) and also for methyl jasmonate

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