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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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A comparative study on the micro-surface characteristics at black shale initial oxidation stage.

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Acidithiobacillus ferrooxidans influences black shale oxidation by promoting jarosite formation and carbon accumulation, potentially inhibiting further reactions. This study reveals distinct micro-surface changes impacting pyrite oxidation rates.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Microbiology

Background:

  • Pyrite oxidation is a critical factor in black shale oxidation.
  • The role of Acidithiobacillus ferrooxidans (A. ferrooxidans) in black shale oxidation remains unclear, despite its known efficacy on pure pyrite.

Purpose of the Study:

  • To comparatively investigate the micro-surface characteristics of black shale during initial oxidation stages (7 days) under acid solution and A. ferrooxidans.
  • To evaluate the impact of these micro-surface changes on pyrite oxidation rates and the overall black shale oxidation degree.

Main Methods:

  • Comprehensive analysis of micro-morphologies, micro-structures, micro-environmental pH, and micro-surface elemental content using polarizing microscopies, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX) line scan analysis.
  • Investigation of pyrite oxidation rate via X-ray Diffraction (XRD), aqueous pH, oxidation-reduction potential (ORP), and ferrous/ferric ion concentration measurements.

Main Results:

  • Distinct micro-surface characteristics were observed between acid solution and A. ferrooxidans treated groups, significantly affecting pyrite oxidation rates.
  • A. ferrooxidans promoted jarosite formation and elemental carbon accumulation on the black shale micro-surface, suggesting an inhibitory effect on further reactions.
  • Two initial reaction phases, 'pyrite oxidized phase' and 'jarosite formation phase', were proposed for A. ferrooxidans mediated black shale oxidation.

Conclusions:

  • Micro-surface reactions play a crucial role in the initial stages of black shale oxidation.
  • A. ferrooxidans exhibits a unique oxidation mechanism on black shale, differing from simple acid dissolution.
  • The findings provide essential experimental data for understanding and evaluating micro-surface reactions in black shale oxidation processes.