Regioselective and Stereospecific Synthesis of β,γ-Unsaturated Carboxylic Acids Using Allylbariums

Abstract
Stereochemically homogeneous (E)- or (Z)-β,γ-unsaturated carboxylic acids were easily prepared in good yield by highly α-selective carboxylation of allylic barium reagents derived from the corresponding allylic chlorides with carbon dioxide.

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