We computationally study the mechanistic pathway for the synthetically valuable cascading N-H functionalization followed by the C-C bond-forming reaction. The impetus to study such multicomponent reactions catalyzed by Rh(I) arises from the highly fluxional nature of the onium ylide involved, which is often not amenable to experimental detection. Our results throw light on an interesting mechanistic paradigm where the binding of the ylide to the metal plays a crucial role. The study provides some much-needed insights to expand the scope of these highly valuable methodologies to a broader range of asymmetric reactions.
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http://dx.doi.org/10.1021/acs.joc.3c00868 | DOI Listing |
Chemistry
November 2024
Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, No. 381, Wushan Road, Tianhe district, Guangzhou, 510641, China.
α-Diazoesters belong to significantly important carbenoid precursors in synthetic chemistry. Diazomethylation-based difunctionalization of alkenes is highly valuable but remain nontrivial. Herein, we reported a general and modular approach for the direct 1,2-oxydiazomethylation of alkenes through visible-light photoredox catalysis.
View Article and Find Full Text PDFOrg Biomol Chem
September 2024
Department of Chemistry, National Institute of Technology, Rourkela, Odisha-769008, India.
Conventionally, carbenium and onium ions are prepared in the presence of nucleophiles due to their instability and transient nature. The nucleophiles that are unstable or inert to the reaction media cannot be used for reaction with the cationic species to access the desired compounds. To overcome these limitations, developing methods for generating organic cations irreversibly in the absence of nucleophiles is essential.
View Article and Find Full Text PDFJ Mol Model
July 2024
College of Chemistry, Nankai University, Tianjin, 300071, China.
Context: The mechanisms for the formation of the first C - C bond and lower olefins on methanol to olefins (MTO) conversion on H-ZSM-5 had been focused in dispute. In this paper, density functional theory has been used to study the reaction mechanisms of methanol to olefins on ZSM-5. The configurations of reactants, intermediates, products and transition state of the numerous reactions involved in such a process have been optimized, as well as the elementary reactions related to these configurations were determined by the calculation of corresponding activation energy barriers and reaction heats.
View Article and Find Full Text PDFJ Org Chem
March 2024
Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation.
Sulfonium, selenonium, telluronium, and iodonium cyanoborohydrides have been synthesized, isolated, and fully characterized by various methods, including single-crystal X-ray diffraction (XRD) analysis. The quantum theory of atoms in molecules' analysis based on the XRD data indicated that the hydride···σ-hole short contacts observed in the crystal structures of each compound have a purely noncovalent nature. The telluronium and iodonium cyanoborohydrides provide a significantly higher rate of the model reaction of imine hydrogenation compared with sodium and tetrabutylammonium cyanoborohydrides.
View Article and Find Full Text PDFJ Org Chem
October 2023
Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA UMR 6014, INC3M FR 3038, F-76000 Rouen, France.
Cation-π interactions between various onium salts, alkynes, and acetylene were studied, taking into account the substituents of the triple bond, the nature of the anions, and the polarity of the solvent, through a combination of MP2 calculations and experiments. In an intramolecular setting, these data (including single-crystal X-ray crystallography) concurred with the stability of folded conformers of alkynyl onium salts, even substituted with electron-withdrawing groups. To examine the contribution of these interactions on the alkyne electronic population, a thorough in silico study was carried out using natural bonding orbital analysis of the conformers.
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