SEARCH Articles Figures Tables Cycloadditions ketenes, imines Imine 2+2] cycloaddition Imines cycloadditions Imines mechanism Ketene 2 + 2] cycloadditions Ketene cycloaddition Ketene imines Ketene-imine Ketene-imine cycloaddition Ketenes cycloaddition Ketenes imines Ketenes, cycloadditions Mechanism ketenes