Spectroscopic Analyses on Reaction Intermediates Formed during Chlorination of Alkanes with NaOCl Catalyzed by a Nickel Complex
作者:Apparao Draksharapu、Zoel Codolà、Laura Gómez、Julio Lloret-Fillol、Wesley R. Browne、Miquel Costas
DOI:10.1021/acs.inorgchem.5b01463
日期:2015.11.16
mechanistic aspects. NaOCl reacts with 1 in acetonitrile to form the transient species [(L)NiII-OCl(S)]+ (A) (L = Me,HPyTACN, S = solvent), which was identified by ESI-MS. UV/vis absorption, electron paramagnetic resonance, and resonance Raman spectroscopy indicate that intermediate A decays to the complex [(L)NiIII–OH(S)]2+ (B) presumably through homolytic cleavage of the O–Cl bond, which liberates a Cl•
[[ Me,H PyTACN)Ni II(CH 3 CN)2 ](OTf)2(1)(Me,H PyTACN = 1-(2-吡啶基甲基)-4,7-描述了二甲基-1,4,7-三氮杂环壬烷,OTf = CF 3 SO 3)及其与NaOCl的反应性。1用NaOCl催化烷烃的氯化反应,仅产生痕量的氧化副产物。用光谱和高分辨率电喷雾质谱法(ESI-MS)监测反应,以阐明机理。NaOCl与1反应在乙腈中形成瞬态物质[(L)Ni II -OCl(S)] +(A)(L = Me,H PyTACN,S =溶剂),已通过ESI-MS鉴定。UV / vis吸收,电子顺磁共振和共振拉曼光谱表明,中间体A可能通过O-Cl键的均相裂解而分解为复合物[(L)Ni III -OH(S)] 2+(B)。释放一个Cl •原子。在所施加的条件下,乙腈水解为乙酸会导致[(L)Ni III -OOCCH 3(S)] 2+(C),然后通过与OCl