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The irradiation of halogen-bonded complexes with light leads to the homolysis of carbon-halogen bonds and the formation of the corresponding carbon radical species. However, the only methodology reported for these halogen-bonding complexes is using CBr 4 as the halogen-bond donor and its applicability is of great interest. In this study, the atom transfer radical addition (ATRA) reaction of olefins using bromomalonates as halogen-bonding donors was developed. Using 4-phenylpyridine as the halogen-bonding acceptor, the desired reaction proceeded well under external irradiation of 380 nm light to furnish the corresponding ATRA reaction product. The ATRA reaction was effective in generating the corresponding products for a variety of olefins. Furthermore, the ATRA reaction was applicable to bulky ketones, substrates, and malonate esters. The intermediates of the reaction were identified and a plausible reaction mechanism was proposed.

Photoinduced Atom Transfer Radical Addition Reaction of Olefins with α-Bromo Carbonyls