Synthesis of (E)-1-Aryl-1-alkenes via a Novel BF(3).OEt(2)-Catalyzed Aldol-Grob Reaction Sequence.
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The reactions of aromatic aldehydes with ketones in the presence of various acids were examined. The reactions generate (E)-1-aryl-1-alkenes in the presence of boron trifluoride diethyl etherate in nonnucleophilic solvents.