贵金属技术的替代以及利用地球上丰富的金属实现新的反应性是可持续合成的核心。迄今为止,烯烃加氢最有效地是通过贵金属催化剂进行的。本研究报道了一种铁催化的三取代和四取代烯烃氢化方案,该方案在温和条件(1-4 bar H 2,20 °C)下具有前所未有的活性和范围。通过分离充当催化剂库和颗粒生长的可溶种子的新型铁纳米簇结构,记录了均相和非均相铁催化界面的指导性快照。
Iridium-Triggered Allylcarbamate Uncaging in Living Cells
作者:Neelu Singh、Ajay Gupta、Puja Prasad、Pritam Mahawar、Shalini Gupta、Pijus K. Sasmal
DOI:10.1021/acs.inorgchem.1c01790
日期:2021.9.6
solubility, stability, toxicity, cell uptake, and reactivity within complex biological milieu for bioorthogonal controlled transformation reactions is a highly formidable challenge. Herein, we report an organoiridium complex that is nontoxic and capable of the uncaging of allyloxycarbonyl-protected amines under biologically relevant conditions and within livingcells. The potential applications of this
设计一种金属催化剂来解决复杂生物环境中的溶解性、稳定性、毒性、细胞吸收和反应性等主要问题,用于生物正交控制的转化反应是一项非常艰巨的挑战。在此,我们报告了一种有机铱络合物,该络合物无毒且能够在生物相关条件下和活细胞内解开烯丙氧羰基保护的胺。通过在 HeLa 细胞内以受控方式激活原荧光团和前药后产生诊断和治疗剂,已经证明了这种解笼锁化学的潜在应用,为许多潜在的生物学和治疗应用提供了宝贵的工具。
A Manganese Nanosheet: New Cluster Topology and Catalysis
作者:Uttam Chakraborty、Efrain Reyes-Rodriguez、Serhiy Demeshko、Franc Meyer、Axel Jacobi von Wangelin
DOI:10.1002/anie.201800079
日期:2018.4.23
and the surface characteristics of larger metal particles are well understood, preparations of molecular metallic nanoclusters remain a great challenge. Discrete planar metal clusters constitute nanoscale snapshots of cluster growth but are especially rare owing to the strong preference for three‐dimensional structures and rapid aggregation or decomposition. A simple ligand‐exchange procedure has led
作者:Philipp Büschelberger、Dominik Gärtner、Efrain Reyes-Rodriguez、Friedrich Kreyenschmidt、Konrad Koszinowski、Axel Jacobi von Wangelin、Robert Wolf
DOI:10.1002/chem.201605222
日期:2017.3.2
First‐row transition‐metal complexes hold great potential as catalysts for hydrogenations and related reductive reactions. Homo‐ and heteroleptic arene/alkene metalates(1−) (M=Co, Fe) are a structurally distinct catalyst class with good activities in hydrogenations of alkenes and alkynes. The first syntheses of the heteroleptic cobaltates [K([18]crown‐6)][Co(η4‐cod)(η2‐styrene)2] (5) and [K([18]cr
New naphthalene complexes of Ru(0) with various Ru(η6-naphthalene)(cyclic diene) (3) ligands catalyze linear cross-dimerization between conjugated dienes and acrylates. One of the noteworthy catalysts is the dibenzocyclooctatetraene complex 3d, which shows high catalytic activity for the cross-dimerization between 1,3-pentadiene and methyl acrylate to give the cross-dimers in 99% yield (branch/linear
Control of Diastereoselectivity for Iridium-Catalyzed Allylation of a Prochiral Nucleophile with a Phosphate Counterion
作者:Wenyong Chen、John F. Hartwig
DOI:10.1021/ja311363a
日期:2013.2.13
We report a highly diastereo- and enantioselective allylation of azlactones catalyzed by the combination of a metallacyclic iridium complex and an optically inactive phosphate anion. The process demonstrates an approach for conducting diastereoselective reactions with prochiralnucleophiles in the presence of metallacyclic allyliridium complexes. The reaction provides access to an array of enantioenriched