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Related Concept Videos

Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

4.9K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Electrophilic Aromatic Substitution: Sulfonation of Benzene01:22

Electrophilic Aromatic Substitution: Sulfonation of Benzene

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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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Introduction to Functional Groups02:08

Introduction to Functional Groups

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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.  
Types of common functional groups
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.0K
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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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.5K
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.
6.5K
Overview of Advanced Functional Groups02:22

Overview of Advanced Functional Groups

24.6K

Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
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24.6K

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KIT-5 Structural and Textural Changes in Response to Different Methods of Functionalization with Sulfonic Groups.

Sylwia Chałupniczak1, Izabela Nowak1, Agata Wawrzyńczak1

  • 1Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.

International Journal of Molecular Sciences
|February 11, 2023
PubMed
Summary

Sulfonic acid functionalized KIT-5 materials were synthesized using grafting and co-condensation methods for heterogeneous catalysis. The co-condensation method yielded stable materials, while grafting preserved KIT-5 structure, showing promise for acid catalysis.

Keywords:
co-condensationfunctionalized KIT-5 mesoporous silicagraftingsolid acid catalyststructural/textural parameters

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Heterogeneous solid acid catalysts are crucial for various chemical transformations.
  • Functionalized mesoporous silica materials offer tunable properties for catalytic applications.
  • KIT-5, a mesoporous silica, presents a unique structure for catalyst design.

Purpose of the Study:

  • To synthesize and characterize sulfonic acid (-SO3H) functionalized KIT-5 materials.
  • To investigate the influence of grafting and co-condensation methods on material properties.
  • To evaluate the catalytic activity of the functionalized KIT-5 materials in Friedel-Crafts alkylation.

Main Methods:

  • Functionalization of KIT-5 with sulfonic acid groups via grafting and co-condensation using 3-mercaptopropyltrimethoxysilane (MPTMS).
  • Oxidation of thiol (-SH) groups to sulfonic acid (-SO3H) groups using hydrogen peroxide (H2O2).
  • Characterization using XRD, low-temperature N2 sorption, and TEM to assess structural, textural, and morphological changes.
  • Catalytic testing via Friedel-Crafts alkylation reactions.

Main Results:

  • Co-condensation successfully produced stable -SO3H functionalized KIT-5 materials.
  • Increased functionalization via co-condensation led to decreased ordering of the KIT-5 mesoporous structure.
  • Grafting resulted in stable KIT-5 structures irrespective of the amount of MPTMS introduced.
  • Synthesized materials demonstrated promising catalytic activity in Friedel-Crafts alkylation.

Conclusions:

  • Both grafting and co-condensation are viable methods for creating -SO3H functionalized KIT-5 catalysts.
  • The choice of synthesis method impacts the structural integrity and catalytic performance.
  • -SO3H/KIT-5 materials show potential as efficient heterogeneous acid catalysts.