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Conversion of Alcohols to Alkyl Halides02:48

Conversion of Alcohols to Alkyl Halides

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This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Preparation of Alcohols via Substitution Reactions01:38

Preparation of Alcohols via Substitution Reactions

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Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group.  The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2,  depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

4.1K
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.2K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Acid Halides to Alcohols: Grignard Reaction01:15

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Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
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Silver(i) Perfluoroalcoholates: Synthesis, Structure, and their Use as Transfer Reagents.

Paul Golz1, Kamar Shakeri1, Lilian Maas1

  • 1Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie-Anorganische Chemie, Fabeckstr. 34/36, 14195, Berlin, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 12, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for synthesizing stable silver(i) perfluoroalcoholates. These compounds serve as versatile transfer reagents for creating various fluorinated metal complexes and ethers.

Keywords:
Fluorine ChemistryMetal SaltsPerfluoroalcoholatesSolvent EffectsTrifluormethoxy

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Area of Science:

  • Organometallic Chemistry
  • Fluorine Chemistry
  • Coordination Chemistry

Background:

  • Perfluoroalcoholates are valuable but often challenging to synthesize and handle.
  • Developing stable precursors for fluorinated compounds is crucial for materials science and catalysis.

Purpose of the Study:

  • To establish a general synthetic route to silver(i) perfluoroalcoholates.
  • To characterize their solid-state and solution structures.
  • To demonstrate their utility as transfer reagents for synthesizing other fluorinated compounds.

Main Methods:

  • Reaction of silver(I) fluoride (AgF) with perfluorinated carbonyl compounds in acetonitrile.
  • X-ray crystallography for solid-state structure determination.
  • Infrared (IR) spectroscopy for solution structure analysis.

Main Results:

  • Stable silver(i) perfluoroalcoholates were successfully synthesized and characterized.
  • X-ray analysis revealed bridged structures with two Ag(i) centers.
  • IR spectroscopy indicated structural diversity in solution.
  • Demonstrated utility as transfer reagents for Cu, Au, and fluorinated ether synthesis.

Conclusions:

  • A reliable method for accessing silver(i) perfluoroalcoholates has been developed.
  • These compounds exhibit interesting structural features in both solid and solution states.
  • Silver(i) perfluoroalcoholates are effective and convenient transfer reagents for synthesizing valuable fluorinated materials.