subsequent β-hydride elimination. Cyclization of an alkyl halide containing a radical clock and epimerization of neohexyl iodide-d2 upon oxidative addition to (3,5-Me2MesCNC)Fe(N2)2 are consistent with radical intermediates during C(sp3)–X bond cleavage. Importantly, while C(sp2)–X and C(sp3)–X oxidative addition produces net two-electron chemistry, the preferred pathway for obtaining the products is
芳基和烷基卤化物与强场三齿钳
配体的还原铁二氮配合物的双电子氧化加成已被证明。 (3,5-Me 2 Mes CNC)Fe(N 2 ) 2中添加
碘苯或
溴苯 (3,5-Me 2 Mes CNC = 2,6-(2,4,6-Me-C 6 H 2 -
咪唑-2-亚基) 2 -3,5-Me 2 -
吡啶) 导致快速氧化加成并形成抗磁性八面体 Fe(II) 产物 (3,5-Me 2 Mes CNC)Fe(Ph)(N 2 )(X),其中 X = I 或 Br。竞争实验确定了芳基卤化物氧化加成的相对速率为 I > Br > Cl。电子分化芳基
溴化物相对反应速率的线性自由能(ρ = 1.5)与协同型途径一致。烷基卤化物(例如甲基卤化物、异丁基卤化物或新戊基卤化物)的氧化加成在室温下也很快,但具有更容易接近的β-氢位置的底物(例如1-
溴丁烷)随后经历了β-氢消除。含有自由基时钟的烷基卤化物的环化和新己基
碘化物-d 2在氧化加成到