Partial oxidation of light alkanes by periodate and chloride salts
作者:Steven E. Kalman、Dominik Munz、George C. Fortman、Nicholas C. Boaz、John T. Groves、T. Brent Gunnoe
DOI:10.1039/c5dt00558b
日期:——
The efficient and selective partial oxidation of light alkanes using potassium periodate and potassium chloride is reported.
报道了使用高碘酸钾和氯化钾对轻烷烃进行高效选择性部分氧化的研究。
S<sub>N</sub>2 and E2 Branching of Main-Group-Metal Alkyl Intermediates in Alkane CH Oxidation: Mechanistic Investigation Using Isotopically Labeled Main-Group-Metal Alkyls
作者:Niles Jensen Gunsalus、Anjaneyulu Koppaka、Brian G. Hashiguchi、Michael M. Konnick、Sae Hume Park、Daniel H. Ess、Roy A. Periana
DOI:10.1021/acs.organomet.0c00120
日期:2020.5.26
transfer studies herein strongly support the simultaneous formation of both species from this intermediate. Furthermore, studies conducted using regiospecifically isotopicallylabeled diethylthallium salts strongly support an SN2 functionalization from EtTl(TFA)2 to give EtTFA (and reduced Tl(TFA)) and an E2 elimination (also from EtTl(TFA)2) to generate ethylene, which instantly reacts with an additional
主要金属烷基化合物三烷基锡和二烷基th已用于研究单烷基th和铅物种的功能化机理,被认为是烷烃(RH)官能化的推定中间体,是通过CH活化烷烃(甲烷,乙烷,和丙烷),使用三氟乙酸(HTFA)中的亲电性Tl(III)和Pb(IV)。使用两种不同的有机金属烷基转移方法原位生成推定的中间体。本文的结果有力地支持了CH活化生成主族金属烷基中间体的机理,该中间体经过还原功能化以生成产物R-TFA和还原的金属盐。在乙烷的情况下,在反应混合物中观察到有两种产物,三氟乙酸乙酯(EtTFA)和1,2-双(三氟乙酰氧基)乙二醇(EG(TFA)2),建议由一种常见的中间体平行形成,EtTl(TFA)2。本文的烷基转移研究强烈支持由该中间体同时形成两种物质。此外,使用区域特异性同位素标记的二乙基th盐进行的研究强烈支持EtT1(TFA)2的S N 2功能化得到EtTFA(和还原的T1(TFA))和E2消除(同样从Et
N-Heterocyclic Carbene Palladium Catalyzed Regioselective Oxidative Trifluoroacetoxylation of Unactivated Methylene sp<sup>3</sup>C–H Bonds in Linear Alkyl Esters
Several N-heterocyclic carbene palladium catalyzed oxidation of nonactivated sp3 C–Hbonds in linear primary and secondary trifluoroacetic acid esters have been developed. A high selectivity for the oxidation of the omega-1 carbon atom in trifluoroacetic acid n-propyl to n-octyl esters was realized by an appropriate choice of N-heterocyclic carbene palladium complexes.
A series of ortho-phenylene bridged palladium bis-NHC complexes has been synthesized. Complexes with imidazolium and benzimidazolium derived NHCs and methyl-/benzyl-wingtips are reported. Bis(benz)imidazoles with a doubly brominated ortho-phenylene bridge could be obtained by an electrophilic substitutionreaction. The structure of the complexes could be confirmed by three solid-state structures. All
Characterization of Functional Groups by Nuclear Magnetic Resonance. I. Classification of Alcohols from the Fluorine-19 Spectra of Trifluoroacetates<sup>1</sup>