Heterogeneous Low-Valent Mn Catalysts for α-Alkylation of Ketones with Alcohols through Borrowing Hydrogen Methodology

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(19), P. 11767 - 11775

Published: Sept. 13, 2022

Alcohol transformations through the borrowing hydrogen (BH) methodology have attracted attention due to its high atom economy and substrate availability. Nonprecious metal heterogeneous catalysts recently been extensively explored; however, difficulty in observation of active species has prevented mechanistic studies. Here, we report on supported Mn that act as reusable for construction C–C bonds by α-alkylation ketones with alcohols BH methodology. The catalyst, a Mn2+ species-MgO mixture-deposited Al2O3 support (Mn-MgO/Al2O3), exhibits catalytic performance reactions give corresponding products 50–92% yield. present catalyst did not require addition homogeneous strong bases are typically indispensable these using reported Mn-based large energy consumption separation, recycling, waste treatment. While such reaction systems considered accelerate dehydrogenation and/or aldol condensation, MgO Mn-MgO/Al2O3, base, does contribute steps. Fourier transform infrared spectroscopy (FT-IR) measurements indicated only incorporation hydride species, which never observed alcohols, but also enhancement hydrogenating capability co-deposited Al2O3. had found direct amination over metallic Ru nano particles-MgO mixture, study reveals mechanism is extended oxidized Mn, base metal, contact MgO.

Language: Английский

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Homoselective synthesis of 5‐substituted 1H‐tetrazoles and one‐pot synthesis of 2,4,5‐trisubstuted imidazole compounds using BNPs@SiO₂‐TPPTSA as a stable and new reusable nanocatalyst

Applied Organometallic Chemistry, Journal Year: 2021, Volume and Issue: 35(4)

Published: Feb. 14, 2021

Considering the importance of tetrazole and imidazole derivatives in pharmacy, industry, explosives, BNPs@SiO 2 ‐TPPTSA was easily prepared used as an effective, stable, renewable nanocatalyst for homoselective synthesis different 5‐substituted 1 H ‐tetrazoles atom economic 2,4,5‐trisubstituted‐1 ‐imidazoles solventless conditions. characterized by transmission electron microscopy (TEM), scanning (SEM), X‐ray diffraction (XRD), energy dispersive analysis (EDX), thermal gravimetric‐differential (TGA‐DTA), mapping, pH analysis, Fourier transform infrared (FT‐IR) techniques. Furthermore, catalyst recycled at least sequential five loads without a remarkable drop‐in catalytic activity.

Language: Английский

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The preparation of a Co@C₃N₄ catalyst and applications in the synthesis of quinolines from 2-aminobenzyl alcohols with ketones

New Journal of Chemistry, Journal Year: 2021, Volume and Issue: 45(15), P. 6768 - 6772

Published: Jan. 1, 2021

A Co@C₃N₄ composite was synthesized through Co-doping of C₃N₄ and revealed high catalytic activity for the synthesis quinolines.

Language: Английский

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Iridium and copper supported on silicon dioxide as chemoselective catalysts for dehydrogenation and borrowing hydrogen reactions

Molecular Catalysis, Journal Year: 2021, Volume and Issue: 505, P. 111516 - 111516

Published: March 23, 2021

Language: Английский

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The synthesis and structure of an amazing and stable carbonized material Cu-PC@OFM and its catalytic applications in water with mechanism explorations

New Journal of Chemistry, Journal Year: 2021, Volume and Issue: 45(21), P. 9614 - 9620

Published: Jan. 1, 2021

An amazing and stable carbonized octahedral frame material Cu-PC@OFM was synthesized characterized through HRTEM, SEM, XRD, XPS, Raman spectroscopy nitrogen adsorption/desorption analysis.

Language: Английский

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