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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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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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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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Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

2.7K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Updated: Jun 17, 2025

The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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Versatile Method for Preparing Two-Dimensional Metal Dihalides.

Rongrong Qi1,2, Yi You1,2, Magdalena Grzeszczyk3,4

  • 1Department of Physics & Astronomy, University of Manchester, Manchester M13 9PL, U.K.

ACS Nano
|August 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create two-dimensional (2D) metal dihalide flakes. This technique yields high-quality 2D materials for studying their unique electronic and optical properties.

Keywords:
Raman scattering spectroscopymechanical exfoliationmetal dihalidesphotoemissionsolvent-assisted recrystallizationtwo-dimensional materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials, following graphene's discovery, offer unique properties.
  • 2D metal dihalides (MX2) are of significant interest for their electrical and magnetic characteristics.

Purpose of the Study:

  • To introduce an innovative method for producing 2D metal dihalide flakes.
  • To investigate the structural, electronic, and optical properties of these 2D materials.

Main Methods:

  • Anhydrous solvent-induced recrystallization of bulk metal dihalide powders (MX2, M=Cu, Ni, Co; X=Br, Cl, I).
  • Crystal exfoliation to obtain 2D flakes.
  • Characterization using X-ray diffraction, Raman scattering, optical spectroscopy, micro-ultraviolet photoemission spectroscopy, and electronic transport measurements.

Main Results:

  • Successful synthesis of large layered crystals of CuBr2, which were exfoliated into 2D flakes.
  • Revealed a quasi-1D chain structure in CuBr2, influencing its optical and scattering properties.
  • Determined the electronic properties, including valence band structure, of 2D CuBr2 flakes.

Conclusions:

  • The anhydrous solvent-induced recrystallization method is versatile for preparing various 2D metal halide flakes.
  • Optical contrast is effective for characterizing flake thicknesses.
  • The methodology enables further study of 2D metal halides for potential applications.