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(A) The coupling reaction with radical clock substrate (E)-1,6-octadiene and varying concentrations of nickel can indicate whether a radical chain mechanism is operative. (B) A comparative graph of relative U/R increase as a function of relative nickel precatalyst loading in nickel-radical cross-coupling mechanistic studies (see refs 18 and 19). The lack of a direct relationship in our work effectively excludes a radical chian mechanism (mechanism C).
