Abstract Atom-transfer radical addition (ATRA) reactions of ethyl trichloroacetate, dichloromalononitrile, or diethyl 2, 2-dichloromalonate with olefins followed by dechlorination have provided functionalized cyclopropanes in one step. The Ru III complex [Cp* RuCl 2 (PPh 3)] was used as a catalyst precursor and commercial Mn powder as reducing agent. Reactions with the less activated substrate ethyl dichloroacetate gave ...