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Examples of previous syntheses: A) with non-transition-metal-mediated C−C bond cleavage, B) transition-metal-mediated cleavage of C−C single bonds resulting in a reactive organometallic intermediate (two-electron reactivity), and C) transition-metal-mediated cleavage of C−C single bonds resulting in a reactive radical intermediate (one-electron reactivity). Cp = cyclopentadienyl, DMPU = dimethylpropylene urea, Piv = pivaloyl, TBS = tert-butyldimethylsilyl, TIPS = triisopropylsilyl.
