Regiospecific construction of m -alkenyl benzaldehyde from β -bromoenal and vinyl borate.

Herein, we report a Pd-catalyzed regiospecific cycloaromatization of β -bromoenal and vinyl borate esters to synthesize m -alkenyl substituted benzaldehydes. This allows the construction of complex molecules from simple materials, which may be useful in the search for new optical materials.