1,1-Dibromoalkenes as Versatile Reagents to a Transition Metal-Free and Stereoselective Synthesis of (E)-1-Bromo-1-selenoalkenes and Ketene Selenoacetals.

Abstract We describe here a metal-free and selective method for the synthesis of ( E )-1-bromo-1-seleno alkenes and ketene selenoacetals by a stoichiometric and temperature-controlled reaction. These protocols employ a diverse array of 1,1-dibromoalkenes and different diaryl diselenides to afford the corresponding products in good yields and in a short reaction time.