Ketone Synthesis by a Nickel-Catalyzed Dehydrogenative Cross-Coupling of Primary Alcohols
作者:Thomas Verheyen、Lars van Turnhout、Jaya Kishore Vandavasi、Eric S. Isbrandt、Wim M. De Borggraeve、Stephen G. Newman
DOI:10.1021/jacs.9b03280
日期:2019.5.1
intermolecular coupling of primaryalcohols and organotriflates has been developed to provide ketones by the action of a Ni(0) catalyst. This oxidative transformation is proposed to occur by the union of three distinct catalytic cycles. Two competitive oxidation processes generate aldehyde in situ via hydrogentransfer oxidation or (pseudo)dehalogenation pathways. As aldehyde forms, a Ni-catalyzed carbonyl-Heck
Et<sub>2</sub>Zn-Mediated Rearrangement of Bromohydrins
作者:Lezhen Li、Peijie Cai、Qingxiang Guo、Song Xue
DOI:10.1021/jo800231s
日期:2008.5.1
and highly efficient method for the rearrangement of bromohydrins mediated by Et2Zn to synthesize carbonylcompounds was described. Various β-bromo alcohols were treated with 0.6 equiv of Et2Zn to form a zinc complex in CH2Cl2 at room temperature for 2 h, followed by 1,2-migration to give the corresponding carbonylcompounds. This remarkable and clean rearrangement is general for acyclic and cyclic bromohydrins
Water as a proton mediator for dioxygen-selective oxidation of alcohols by a planar dinuclear butterfly-like Cu Cu bonding complex: A combined experimental and computational study
The selective catalytic oxidation of alcohols is important both in laboratory and industrial production, and traditional oxidants cause environmentally lethal wastes. The development of dioxygen selective oxidationefficient has been pursued from atom-efficient, economic and environmental view of points. Using DFT calculation and ESI-MS experiments, we studied the activation of the CuCu bonded planar
Photoinduced Acylations Via Azolium-Promoted Intermolecular Hydrogen Atom Transfer
作者:Joshua L. Zhu、Cullen R. Schull、Anthony T. Tam、Ángel Rentería-Gómez、Achyut Ranjan Gogoi、Osvaldo Gutierrez、Karl A. Scheidt
DOI:10.1021/jacs.2c12845
日期:2023.1.25
Photoinduced hydrogenatomtransfer (HAT) has been developed as a powerful tool to generate synthetically valuable radical species. The direct photoexcitation of ketones has been known to promote HAT or to generate acyl radicals through Norrish-type pathways, but these modalities remain severely limited by radical side reactions. We report herein a catalyst- and transition metal-free method for the
光致氢原子转移 (HAT) 已被开发为生成具有合成价值的自由基物种的强大工具。已知酮的直接光激发可促进 HAT 或通过 Norrish 型途径产生酰基自由基,但这些方式仍然受到自由基副反应的严重限制。我们在此报告了一种无催化剂和过渡金属的 C-H 键酰化方法,该方法利用了稳定、可分离的酰基唑鎓物种的独特性质。具体而言,酰基唑盐显示在 LED 照射下会发生分子间和区域选择性 HAT,一系列底物带有活性 C-H 键,随后形成 C-C 键以提供酮。