Kinetics and mechanisms of oxygen transfer in the reaction of p-cyano-N,N-dimethylaniline N-oxide with metalloporphyrin salts. 2. Amine oxidation and oxygen transfer to hydrocarbon substrates accompanying the reaction of p-cyano-N,N-dimethylaniline N-oxide with meso-(tetraphenylporphinato)iron(III) chloride
<i>N</i>-Demethylation of <i>N,N</i>-Dimethylanilines by the Benzotriazole <i>N</i>-Oxyl Radical: Evidence for a Two-Step Electron Transfer−Proton Transfer Mechanism
The reaction of the benzotriazole N-oxyl radical (BTNO) with a series of 4-X-N,N-dimethylanilines (X = CN, CF3, CO2CH2CH3, CH3, OC6H5, OCH3) has been investigated in CH3CN. Product analysis shows that the radical, 4-X-C6H4N(CH3)CH2•, is first formed, which can lead to the N-demethylated product or the product of coupling with BTNO. Reaction rates were found to increase significantly by increasing the
OPh, CF3, CO2Et, CN) has been investigated by product and kineticanalysis. PINO was generated in CH3CN by reaction of N-hydroxyphthalimide (NHPI) with Pb(OAc)4 or, for the kinetic study of the most reactive substrates (X = OMe, OPh), with tert-butoxyl radical produced by 266 nm laser flashphotolysis of di-tert-butyl peroxide. The reaction was found to lead to the N-demethylation of the N,N-dimethylaniline
Mechanistic Investigation of Oxidative Mannich Reaction with <i>tert</i>-Butyl Hydroperoxide. The Role of Transition Metal Salt
作者:Maxim O. Ratnikov、Michael P. Doyle
DOI:10.1021/ja3113559
日期:2013.1.30
heterolytic cleavage of the carbon-hydrogenbond at the α-position to nitrogen. A second SET completes the conversion of N,N-dimethylaniline to an iminium ion that is subsequently trapped by the nucleophilic solvent or the oxidant prior to formation of the Mannich adduct. The general role of Rh(2)(cap)(4), RuCl(2)(PPh(3))(3), CuBr, FeCl(3), and Co(OAc)(2) in N,N-dialkylaniline oxidations by T-HYDRO is to initiate
提出了过渡金属催化 N,N-二烷基苯胺与叔丁基过氧化氢 (TBHP) 作为氧化剂的氧化曼尼希反应的一般机制。该机制包括从 4-甲氧基到 4-氰基-N,N-二甲基苯胺均匀的限速单电子转移 (SET)。叔丁基过氧自由基是决定速率的 SET 步骤中的主要氧化剂,随后是竞争性向后 SET 和 α 位碳氢键的不可逆异裂裂解为氮。第二个 SET 完成 N,N-二甲基苯胺向亚胺离子的转化,亚胺离子随后在形成曼尼希加合物之前被亲核溶剂或氧化剂捕获。Rh(2)(cap)(4)、RuCl(2)(PPh(3))(3)、CuBr、FeCl(3) 和 Co(OAc)(2) 在 N 中的一般作用,T-HYDRO 氧化 N-二烷基苯胺是为了启动 TBHP 向叔丁基过氧自由基的转化。第二种途径涉及 O(2) 作为氧化剂,存在于铜盐、铁盐和钴盐中。讨论了线性自由能关系 (LFER) 分析、动力学和产物同位素效应(KIE 和
Kinetics and mechanisms of oxygen transfer in the reaction of p-cyano-N,N-dimethylaniline N-oxide with metalloporphyrin salts. 2. Amine oxidation and oxygen transfer to hydrocarbon substrates accompanying the reaction of p-cyano-N,N-dimethylaniline N-oxide with meso-(tetraphenylporphinato)iron(III) chloride
作者:C. Michael Dicken、Fu Lung Lu、Michael W. Nee、Thomas C. Bruice
DOI:10.1021/ja00306a027
日期:1985.10
Isotope effect profiles in the N-demethylation of N,N-dimethylanilines: a key to determine the pK<sub>a</sub>of nonheme Fe(<scp>iii</scp>)–OH complexes
作者:Alessia Barbieri、Martina De Gennaro、Stefano Di Stefano、Osvaldo Lanzalunga、Andrea Lapi、Marco Mazzonna、Giorgio Olivo、Barbara Ticconi
DOI:10.1039/c5cc00411j
日期:——
pKaof [(N4Py)FeIII–OH]2+is obtained from the kinetic isotope effect profiles in theN-demethylation ofN,N-dimethylanilines promoted by [(N4Py)FeIVO]2+.