Abstract
Abstract Ethyl 2-acetyl-4, 9-decadienoate, easily obtained by the palladium catalyzed telomerization of butadiene with ethyl acetoacetate, was selectively hydrogenated to ethyl 2-acetyl-9-decenoate using RuCl2 (PPh3)3 as a catalyst. Deacetylation, followed by hydrolysis produced 4-decenoic acid, which was converted into acid chloride. The AlCl3-promoted cyclization gave 2-pentyl-2-cyclopentenone, from which methyl dihydrojasmonate was prepared.
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