 a redox - economic 
 method for the direct coupling of olefins that 
 uses an inexpensive iron catalyst and a silane reducing agent is reported . 
 
 thus , unactivated olefins can be joined directly to electron - deficient 
 olefins in both intra- and intermolecular settings to generate hindered 
 bicyclic systems , vicinal quaternary centers , and even cyclopropanes 
 in good yield . 
 the reaction is not sensitive to oxygen or moisture 
 and has been performed on gram - scale . 
 most importantly , it allows 
 access to many compounds that would be difficult or perhaps impossible 
 to access using other methods . 
Supplementary Material