Before discussing the reaction mechanism of cobalt hydrides, This strategy inspired the method of Isayama and Mukaiyama, in which the carbon radicals generated from cobalt hydride and alkenes react with various radical scavengers. Hydroazidation and hydrochlorination have been developed using this method. However, We included an electrophilic fluorinating agent to the reagents (cobalt salen complex, silyl hydride) and cobalt hydride was formed, which led to the discovery of MHAT/RPC. The mechanism of MHAT/RPC is discussed below.