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Related Concept Videos

Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Acid Halides to Carboxylic Acids: Hydrolysis01:01

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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
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α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
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Radical Substitution: Allylic Chlorination01:31

Radical Substitution: Allylic Chlorination

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Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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Electrophilic Addition to Alkynes: Hydrohalogenation02:35

Electrophilic Addition to Alkynes: Hydrohalogenation

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Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Poly(vinyl chloride) Dechlorination Catalyzed by Zirconium.

Adrien T Normand1, Yue Wu2, Tiffanie Régnier3

  • 1Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), 9 avenue Alain Savary, 21078, Dijon Cedex, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 5, 2024
PubMed
Summary

Poly(vinyl chloride) (PVC) can be dechlorinated using a novel zirconium catalyst and triethylsilane (Et3SiH). This process efficiently removes chlorine from PVC and related consumer products.

Keywords:
DechlorinationEarth-abundant metalsPVCSilanes

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Area of Science:

  • Polymer Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Poly(vinyl chloride) (PVC) is a widely used plastic with environmental concerns related to its chlorine content.
  • Dechlorination of PVC is a key step towards its degradation or modification.
  • Existing methods for PVC dechlorination may lack efficiency or require harsh conditions.

Purpose of the Study:

  • To investigate the catalytic activity of a novel zirconium complex for the dechlorination of PVC.
  • To elucidate the reaction mechanism of PVC dechlorination using triethylsilane (Et3SiH).
  • To explore the applicability of this method to common consumer PVC products.

Main Methods:

  • Catalytic dechlorination of PVC using [Cp2Zr(NPh2)][CH3B(C6F5)3] (1b) and Et3SiH at 40-80°C.
  • Stoichiometric reactivity studies using cyclohexyl chloride as a model compound.
  • Analysis of consumer items including pipe fittings, vinyl discs, and electric cable insulation.

Main Results:

  • Achieved up to 91% efficiency in PVC dechlorination under mild conditions.
  • Identified a reaction mechanism involving initial chloride abstraction followed by hydride transfer.
  • Demonstrated successful dechlorination or hydrosilylation of various PVC-based consumer products.

Conclusions:

  • The novel zirconium catalyst effectively dechlorinates PVC in the presence of Et3SiH.
  • The catalytic system offers a promising route for PVC modification and potential recycling.
  • The method is applicable to real-world PVC-containing materials.