 Several cycloadditions wherein the ylide serves as a " nucleophilic carbenoid equivalent " have been reported . 
 Several cycloadditions <a href='uninflect' title='1'><mark>wherein</mark></a> the ylide <a href='uninflect' title='2'><mark>serves</mark></a> as a " nucleophilic carbenoid equivalent " <a href='been_done' title='3'><mark>have</mark></a> been reported . 
Several cycloadditions whereined the ylide serve as a " nucleophilic carbenoid equivalent " done been reported .