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Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Conjugate Addition to α,β-Unsaturated Carbonyl Compounds01:09

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α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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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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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

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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.
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Related Experiment Video

Updated: Dec 14, 2025

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

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Coffinite formation from UO2+x.

Stéphanie Szenknect1, Delhia Alby2, Marta López García3

  • 1ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Bagnols sur Cèze, France. stephanie.szenknect@cea.fr.

Scientific Reports
|July 24, 2020
PubMed
Summary
This summary is machine-generated.

Spent nuclear fuel (SNF) primarily consists of uranium dioxide (UO2). Researchers observed the formation of coffinite (USiO4), an important SNF alteration product, on UO2 surfaces under simulated geologic disposal conditions.

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Area of Science:

  • Nuclear Chemistry
  • Geochemistry
  • Materials Science

Background:

  • Spent nuclear fuel (SNF) disposal is a global challenge, with most destined for deep geological repositories.
  • Uranium dioxide (UO2) constitutes approximately 96% of SNF, necessitating understanding its long-term behavior under disposal conditions.
  • Natural uranium deposits indicate that coffinite (USiO4) often forms over uraninite (UO2+x) during alteration events, highlighting its significance as an SNF alteration product.

Purpose of the Study:

  • To investigate the formation of coffinite on UO2 under conditions relevant to geologic disposal.
  • To provide experimental evidence for coffinite formation on UO2 at laboratory time scales.

Main Methods:

  • Laboratory experiments using UO2 samples.
  • Exposure to a silica-saturated solution at pH 9.
  • Anoxic conditions and room temperature were maintained.

Main Results:

  • The study presents the first experimental evidence of coffinite formation on UO2 surfaces.
  • Coffinite formation was observed within the time scale of laboratory experiments.
  • Conditions mimicked those expected in deep geologic repositories.

Conclusions:

  • Coffinite is a key alteration product of UO2 under simulated geologic disposal conditions.
  • Understanding coffinite formation is crucial for assessing the long-term safety of SNF disposal.
  • This research provides a foundational understanding for predicting SNF behavior over extended periods.