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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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Halogenation of Alkenes02:46

Halogenation of Alkenes

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Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Radical Chain-Growth Polymerization: Mechanism01:09

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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 species into...
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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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Reductive halocyclosilazane polymerization.

Carlton P Folster1, Phi N Nguyen, Rebekka S Klausen

  • 1Department of Chemistry, Johns Hopkins University, 3400 N. Charles St, Baltimore, MD 21218, USA. klausen@jhu.edu.

Dalton Transactions (Cambridge, England : 2003)
|January 30, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a chloro-functionalized cyclosilazane and polymerized it into polysilazanes. The metal used for reduction impacted the polysilazane structure, showing extended conjugation. This offers new routes to silicon-nitrogen polymers.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Inorganic Chemistry

Background:

  • Cyclosilazanes are precursors to silicon nitride materials.
  • Controlled polymerization of cyclosilazanes is key to tuning polymer properties.

Purpose of the Study:

  • To synthesize a novel chloro-functionalized cyclosilazane.
  • To investigate the reductive polymerization of this cyclosilazane.
  • To understand the influence of reducing metals on polysilazane structure and properties.

Main Methods:

  • Synthesis of a six-membered chloro-functionalized cyclosilazane.
  • Reductive polymerization using different metals.
  • Nuclear Magnetic Resonance (1H and 29Si NMR) spectroscopy for structural analysis.
  • Optical characterization to assess electronic properties.

Main Results:

  • Successful synthesis of the target cyclosilazane.
  • Formation of low molecular weight polysilazanes.
  • Demonstration that the choice of reducing metal influences the resulting polysilazane structure.
  • Evidence of extended sigma-conjugation in the polymerized material.

Conclusions:

  • The reductive polymerization of chloro-functionalized cyclosilazanes offers a pathway to novel polysilazanes.
  • The electronic properties of the resulting polymers are tunable via metal selection during reduction.
  • The findings contribute to the development of advanced silicon-based materials.