Ligand Tuning in Pyridine-Alkoxide Ligated Cp*Ir<sup>III</sup> Oxidation Catalysts
作者:Emma V. Sackville、Gabriele Kociok-Köhn、Ulrich Hintermair
DOI:10.1021/acs.organomet.7b00492
日期:2017.9.25
these precursors to catalytic C–H oxidation of ethyl benzenesulfonate with aqueous sodium periodate showed that the ligand substitution pattern, solution pH, and solvent all have pronounced influences on initial rates and final conversion values. Correlation with O2 evolution profiles during C–H oxidation catalysis showed these competing reactions to occur sequentially, and demonstrates how it is possible
吡啶醇盐连接的六种新型衍生物Cp * Ir III配合物(均质水和CH-H氧化催化剂的有效前体)已经合成,表征并通过光谱和动力学分析了配体效应。发现醇盐和吡啶取代基的变化会影响它们的溶液形态,活化行为和氧化动力学。这些前体在高碘酸钠水溶液催化CH-H氧化苯磺酸乙酯中的应用表明,配体的取代方式,溶液的pH值和溶剂都对初始速率和最终转化率有显着影响。与O 2相关 在C–H氧化催化过程中的演化曲线表明,这些竞争反应是相继发生的,并证明了如何通过N ^ O配体结构调节活性物种的活性和选择性。
Proton NMR and IR study of self-association in pyridylalkanols: open or cyclic dimers? higher polymers?
作者:John S. Lomas、Alain Adenier、Christine Cordier
DOI:10.1002/poc.1056
日期:2006.5
The IR spectra of 3-(X-pyridyl)-2,2,4,4-tetramethylpentan-3-ols (X = 3 or 4) in carbon tetrachloride suggest weak association, while the 2-pyridyl derivative occurs mainly as the intramolecularly hydrogen-bonded rotamer. The OH NMR shifts for the 3- and 4-pyridyl derivatives in benzene are concentration-dependent, but neither the equilibrium constants nor the degree of association can be evaluated
Butyllithium-Mediated Coupling of Aryl Bromides with Ketones under In-Situ-Quench (ISQ) Conditions: An Efficient One-Step Protocol Applicable to Microreactor Technology
Exploiting the high rate of bromine-lithium exchange reactions, aryl carbinols such as fenpy-type ligands are readily obtained by simply combining a mixture of a ketone and an aryl bromide with butyllithium.
Halogen–Lithium Exchange of Sensitive (Hetero)aromatic Halides under Barbier Conditions in a Continuous Flow Set-Up
作者:Niels Weidmann、Rodolfo H. V. Nishimura、Paul Knochel、Johannes H. Harenberg
DOI:10.1055/s-0040-1707259
日期:2021.2
In memory of Prof. Dr. Kilian Muñiz Abstract A halogen–lithium exchange reaction of (hetero)aromatic halides performed in the presence of various electrophiles such as aldehydes, ketones, Weinreb amides, and imines using BuLi as exchange reagent and a commercially available flow set-up is reported. The organolithiums generated in situ were instantaneously trapped with various electrophiles (Barbier
Synthesis, structure and oxo-transfer properties of dioxotungsten(VI) complexes with pyridine-based NO-and NS-bidentate ligands
作者:Yee-Lok Wong、Qingchuan Yang、Zhong-Yuan Zhou、Hung Kay Lee、Thomas C. W. Mak、Dennis K. P. Ng
DOI:10.1039/b006979p
日期:——
2-pyridylalkoxo NO-bidentate ligands [HLn (n = 1–5)] in the presence of n-BuLi or 2-pyridylthiolato NS-bidentate ligands [LiLn (n = 6, 7)] gave the corresponding dioxotungsten(VI) complexes [WO2(Ln)2] (n = 1–7). The new compounds were spectroscopically characterised and the molecular structures of [WO2(Ln)2] (n = 3–5) were also determined by X-ray diffraction analysis. While the complexes [WO2(Ln)2] (n = 4