10.1246/bcsj.80.2400
The research focuses on the synthesis of α,β-unsaturated ketones from acid chlorides through a series of chemical reactions involving the formation and cleavage of carbon-pentamethylcyclopentadienyl bonds. The purpose of this study was to develop a new method for synthesizing α,β-unsaturated ketones, which are known to isomerize easily under acidic or basic conditions, making their synthesis often complicated. The researchers concluded that they had successfully developed a three-step method to synthesize these ketones with good yields. The process involved the reaction of acid chlorides with lithium pentamethylcyclopentadienide to form pentamethylcyclopentadienyl ketones, which were then treated with an allylaluminum reagent to form 3-butenyl alcohols. The final step involved the removal of pentamethylcyclopentadiene, either by heating or treatment with a catalytic amount of trichloroacetic acid, to yield the corresponding α,β-unsaturated ketones. Key chemicals used in this process included various acid chlorides, lithium pentamethylcyclopentadienide, allylaluminum reagents, and trichloroacetic acid.
