Manganese Dioxide

Cahiez, Gérard; Alami, Mouâd; Taylor, Richard J. K.; Reid, Mark; Foot, Jonathan S.; Fader, Lee

doi:10.1002/047084289x.rm021.pub3

Cited by 6 publications

(6 citation statements)

References 88 publications

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“…13 The results illustrate important new dehydrogenative reactions that use O 2 as the terminal oxidant, which provide the basis for replacement of undesirable, yet widely used, stoichiometric oxidants such as DDQ 14 and Mn oxides. 15 …”

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confidence: 99%

Palladium-Catalyzed Aerobic Oxidative Dehydrogenation of Cyclohexenes to Substituted Arene Derivatives

Iosub

Stahl

2015

J. Am. Chem. Soc.

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A palladium(II) catalyst system has been identified for aerobic dehydrogenation of substituted cyclohexenes to the corresponding arene derivatives. Use of sodium anthraquinone-2-sulfonate (AMS) as a co-catalyst enhances the product yields. A wide range of functional groups are tolerated in the reactions, and the scope and limitations of the method are described. The catalytic dehydrogenation of cyclohexenes is showcased in an efficient route to a phthalimide-based TRPA1 activity modulator.

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confidence: 99%

Palladium-Catalyzed Aerobic Oxidative Dehydrogenation of Cyclohexenes to Substituted Arene Derivatives

Iosub

Stahl

2015

J. Am. Chem. Soc.

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“…The use of this elaborate annealing scheme was motivated by the necessity of obtaining the stabilization of the Mn 4+ ions at the octahedral site. Indeed, manganese (IV) dioxide begins to decompose at 535 °C to manganese (III) oxide and oxygen [ 20 ]. The highest intensity of red emission from Mn 4+ in MgAl 2 O 4 was achieved by the final annealing at 1300 °C with the addition of boric acid (H 3 BO 3 ) as flux.…”

Section: Resultsmentioning

confidence: 99%

Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels

et al. 2021

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Samples of magnesium aluminum spinel ceramics doped with manganese ions were prepared by a high-temperature solid-state reaction method; their potential as red-emitting phosphors was analyzed using a time-resolved luminescence spectroscopy technique, from room temperature to 10 K. It was found that in the red spectral range, the luminescence spectra of manganese ions in the MgAl2O4 spinel showed a narrow band peaking at 651 nm due to the emission of Mn4+ and a broader emission band in the region of 675 ÷ 720 nm; the ratio of intensities for these bands depends on the synthesis conditions. By applying a special multi-step annealing procedure, the MgAl2O4:Mn4+ phosphor containing only tetravalent manganese ions, Mn4+, was synthesized. Broad-band far-red emission observed from MgAl2O4:Mn and Mg1.25Al1.75O3.75F0.25:Mn phosphors, prepared by a conventional method of a solid-state reaction, was interpreted as coming from Mn3+ ions.

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“…Thei ntroduction of the C21 methyl group waso riginally achieved by iron-mediated coupling, [22] and a-methylenone 7 was obtained in 75 %y ield.H owever,t he reproducibility of this reaction was also found to be problematic. Namely,p redominant formationo ft ertiary alcohol 25 was occasionally observed( Table 2, entry 1).…”

Section: Synthesis Of Tricyclic Intermediatementioning

confidence: 99%

Synthesis of the Right‐Side Structure of Type B Physalins

Morita

Kojima

Ohkubo

et al. 2016

Israel Journal of Chemistry

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We present a full account of our synthetic studies on the racemic DEFGH‐ring moiety of physalins, featuring domino ring transformation of a tricyclic key intermediate. We also report the results of a detailed mechanistic examination of the domino ring transformation, as well as a reoptimization of the 2,3‐Wittig rearrangement and methylation steps. Furthermore, we have newly established a method for the preparation of an optically active synthetic intermediate by enzymatic kinetic resolution. Our work provides access to both natural and nonnatural right‐side physalin structures.

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Manganese Dioxide

Cited by 6 publications

References 88 publications

Palladium-Catalyzed Aerobic Oxidative Dehydrogenation of Cyclohexenes to Substituted Arene Derivatives

Palladium-Catalyzed Aerobic Oxidative Dehydrogenation of Cyclohexenes to Substituted Arene Derivatives

Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels

Synthesis of the Right‐Side Structure of Type B Physalins

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