Heterogeneous Catalytic Oxidation of Amides to Imides by Manganese Oxides

Abstract

Herein, we report a one-step peroxide mediated heterogeneous catalytic oxidation of amides to imides utilizing a series of manganese oxides. Among them, Cs/Mn2O3 was found to be the most active catalyst for the selective partial oxidation of N-benzylbenzamide to diphenyl imide. We have been able to apply an optimized oxidation method to other aromatic substrates. The feasibility of using air as an oxidant, the heterogeneous nature, inexpensive catalytic materials, respectable turnover numbers, and chemoselectivity to imides make this methodology an attractive choice for functional group transformations of amides to imides.

Determination of Electroactive Surface Area of Ni-, Co-, Fe-, and Ir-Based Oxide Electrocatalysts

“…Metal oxides constitute a class of materials with widespread applications, ranging from energy storage devices ( e.g., supercapacitors and batteries − ), to superconductors − or various medical applications, , to classical heterogeneous catalysts and electrocatalysts. − Currently, the research focus has been mainly set on the development of supported nanostructures with optimized electrochemically active surface area (ECSA). − However, the assessment of ECSA of oxide electrodes is nowadays often no more than a very rough estimation; or its reasonable determination is not possible at all. The lack of a widely accepted methodology for the above-mentioned problem practically impedes benchmarking of material properties and their further optimization.…”

Selective Oxidative Coupling of Amines Using Mesoporous MoOx Catalysts

“…The thermal stability studies reveal that meso -MoO x -300 was fairly stable with a minimal mass loss attributed to the loss of water and P123 up to 350 °C. This is common with UCT-type materials where P123 is detected even at calcination temperatures up to 350 °C . Next, a large mass loss was observed above 750 °C, corresponding to phase transformation to monoclinic from orthorhombic MoO 3 (Figure S4).…”

“…This is common with UCT-type materials where P123 is detected even at calcination temperatures up to 350 °C. 58 Next, a large mass loss was observed above 750 °C, corresponding to phase transformation to monoclinic from orthorhombic MoO 3 (Figure S4). Going from the assynthesized material to a final calcination temperature of 250 °C, the conversion of the randomized platelet-type morphology to a largely homogeneous fiber-type morphology was observed using SEM.…”

Lithium promoted mesoporous manganese oxide catalyzed oxidation of allyl ethers

“…A fourfold decrease in the rate constant (i.e., from 2.82 min −1 for NHPI–O 2 –CCl 3 CN to the 0.71 min −1 by TBHP–CCl 3 CN-based reaction) discouraged us from using this catalytic system. Moreover, we have independently determined that Mn 2 O 3 is an extremely potent material for decomposing TBHP into t-BuOH and O 2 29 . Since O 2 is highly abundant and cheap, we focused our work using O 2 as an oxidant, not only due to the relatively poor rates of TBHP–CCl 3 CN system.

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