Density functional theory calculations were performed to explore the mechanism of Ni-catalyzed cross-coupling reactions involving organo-lithium and -zinc reagents through ethereal C-O bond cleavage. Based on this work, together with our previous mechanistic study on etheric Kumada-Tamao reaction, we identify and characterize a novel catalytic cycle for cross-coupling mediated by Ni(0)-ate complex.
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http://dx.doi.org/10.1248/cpb.c17-00487 | DOI Listing |
Chemistry
January 2025
University of Regensburg, Inorganic Chemistry, Universitätsstrasse 31, D-93040, Regensburg, GERMANY.
The systematic nucleophilic functionalization of the cationic pentaphosphole ligand complex [Cp*Fe(η4-P5Me)][OTf] (A) with group 16/17 nucleophiles is reported. This method represents a highly reliable and versatile strategy for the design of novel transition-metal complexes featuring twofold substituted end-deck cyclo-P5 ligands, bearing unprecedented hetero-element substituents. By the reaction of A with classical group 16 nucleophiles, complexes of the type [Cp*Fe(η4-P5MeE)] (E = OEt (1), OtBu (2), SPh (3), SePh (4)) are obtained.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan453007,China.
Borenium ions have attracted significant attention in organic transformations due to their strong Lewis acidity. The reported borenium ions are often stabilized by sterically demanding substituents and strong coordination bonds. Herein, we have synthesized a small steric borenium-equivalent NHBHOTf and subjected it to the exhaustive reduction of a carboxylic functional group to a methyl group, which shows broad functional group tolerance.
View Article and Find Full Text PDFChem Commun (Camb)
January 2025
School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
The reduction of aryl carboxylates to methyl and allyl arene was attained using a well-defined cobalt catalyst. This catalytic transformation employs only a sub-stoichiometric amount of base, and diethylsilane as a reductant. Catalytic activation of the Si-H bond of the silanes, C-O bond of the ester, and silyl ether intermediates by cobalt is crucial to achieving exhaustive reduction.
View Article and Find Full Text PDFOrg Lett
January 2025
Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741246, India.
An organophotocatalyzed approach for the chemoselective dealkylation of phenols is developed. This method demonstrates exceptional selectivity toward the cleavage of phenolic ethers over equivalent aliphatic ethers and alkyl benzoates, presenting a broad range of functional group sustainability. This strategy also enables selective debenzylation of phenols in the presence of reduction-sensitive functional groups.
View Article and Find Full Text PDFEcotoxicol Environ Saf
December 2024
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi 712100, China. Electronic address:
Dissolved organic matter (DOM) released by straw returning for decomposition interacts with selenium (Se) in soil, which affects the speciation distribution of Se and its bioavailability. However, the relative mechanisms involved are slightly understood. This study investigated the effects of straw-derived DOM on two levels of exogenous selenite (low-Se and high-Se treatments) in two types of soil with distinct pH.
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