NiCl/CrCl2 Coupling Cont Transmetalation Cr(lr) Ni-Ⅹ Cr(Il) XEL Br. oti Oxidative Addition RCHO Ni(0) Ni(n)* R 2Cr(Im) OH Takai, K, Tagashira, M, Kuroda, T, Oshima, K; Utimoto, K; Nozaki, H J. Am. Chem. Soc. 1986, 108, 6048NiCl2/CrCl2 Coupling Cont. Coupling Cont. Transmetalati Transmetalation X Ni-X Cr(III) RCHO R OH Cr(III) Ni(0) Ni(II) 2Cr(III) 2Cr(II) X= I, Br, OTf Oxidative Addition Oxidative Addition Takai, K.; Tagashira, M.; Kuroda, T.; Oshima, K.; Utimoto, K.; Nozaki, H. J. Am. Chem. Soc. 1986, 108, 6048