Three powerful dinuclear metal–organic catalysts for converting CO<sub>2</sub> into organic carbonates
作者:Dan Zhao、Xiao-Hui Liu、Zhuang-Zhi Shi、Chen-Dan Zhu、Yue Zhao、Peng Wang、Wei-Yin Sun
DOI:10.1039/c6dt02755e
日期:——
NH2-functionalized tripodal ligand 2-((bis(2-aminoethyl)amino)methyl)phenol (HL), three dinuclear metal–organic complexes [Zn(L)]2·2ClO4 (1), [Cu(L)]2·2ClO4·2H2O (2) and [Cd(L)]2·2ClO4 (3) have been successfully isolated and structurally characterized using single-crystal X-ray diffraction analyses. Considering the dinuclear metal centers and the NH2-functional groups in the structures, 1–3 were investigated as
Cyclic Carbonate Synthesis Catalysed by Bimetallic Aluminium-Salen Complexes
作者:William Clegg、Ross W. Harrington、Michael North、Riccardo Pasquale
DOI:10.1002/chem.201000030
日期:——
aluminium–salen complexes [Al(salen)}2O] as catalysts for the synthesis of cycliccarbonates (including the commercially important ethylene and propylene carbonates) from a wide range of terminal epoxides in the presence of tetrabutylammonium bromide as a cocatalyst is reported. The bimetallic structure of one complex was confirmed by X‐ray crystallography. The bimetallic complexes displayed exceptionally high
TBD/Alkyl Halide-catalyzed Synthesis of Cyclic Carbonates from CO<sub>2</sub>
作者:Seungyeon Lim、Yu Na Lim、Hye-Young Jang
DOI:10.1002/bkcs.10724
日期:2016.4
Intramolecular C(sp
<sup>3</sup>
)–H Bond Oxygenation by Transition‐Metal Acylnitrenoids
作者:Yuqi Tan、Shuming Chen、Zijun Zhou、Yubiao Hong、Sergei Ivlev、K. N. Houk、Eric Meggers
DOI:10.1002/anie.202009335
日期:2020.11.23
used for controlled directC(sp3)‐H oxygenations. Specifically, a rutheniumcatalyst activates N‐benzoyloxycarbamates as nitrene precursors towards regioselective intramolecular C−H oxygenations to provide cyclic carbonates, hydroxylated carbamates, or 1,2‐diols. The method can be applied to the chemoselective C−H oxygenation of benzylic, allylic, and propargylic C(sp3)−H bonds. The reaction can be
ring-opening carboxylation of styrene carbonates with CO2 to achieve dicarboxylic acids and/or β-hydroxy acids has been developed via the selective cleavage of the C(sp3)–O bond in cyclic carbonates. The product selectivity is probably determined by the stability and reactivity of the key benzylic radical and carbanionintermediate.
通过选择性裂解环状碳酸酯中的 C(sp 3 )–O 键,开发了苯乙烯碳酸酯与 CO 2的电还原开环羧化以获得二羧酸和/或β-羟基酸。产物选择性可能由关键的苄基和碳负离子中间体的稳定性和反应性决定。