SEARCH Articles Figures Tables 1,2 Dimethyl cyclopropane Cyclopropane, 2,2-dimethyl-1 -methylenecodimerization cycloaddition reactions Cyclopropane, 2,2-dimethyl-1 -methylenecodimerization metal catalyzed Cyclopropane, 2,2-dimethyl-1 -methylenecodimerization nickel catalyzed