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Treatment of aryl bromides with homoallyl alcohols bearing a trimethylene group at the allylic position in the presence of cesium carbonate under palladium catalysis affords (2-arylethylidene)cyclobutanes selectively. The selective formation of the alkylidenecyclobutane skeleton results from regiospecific retro-allylation of the homoallyl alcohols, which accompanies the transposition of the double bonds.
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Yorimitsu et al. (2009) studied this question.
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