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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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 catalyst, high molecular...
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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 the...
Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Preparation of Alkynes: Alkylation Reaction

Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.

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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

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Published on: December 24, 2014

Linear alkane polymerization on a gold surface.

Dingyong Zhong1, Jörn-Holger Franke, Santhosh Kumar Podiyanachari

  • 1Physikalisches Institut, Universität Münster, Münster, Germany.

Science (New York, N.Y.)
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers achieved selective carbon-hydrogen activation and carbon-carbon coupling of long-chain alkanes. This breakthrough utilizes a reconstructed gold surface to guide the reaction exclusively to specific sites on the hydrocarbon chains.

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Area of Science:

  • Surface Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Selective functionalization of saturated hydrocarbons remains a significant challenge in chemistry.
  • Existing methods often lack predictability and efficiency for long-chain alkanes.
  • Catalytic C-H activation offers a promising route for alkane functionalization.

Purpose of the Study:

  • To develop a method for predictable C-C coupling of long-chain alkanes.
  • To investigate the role of surface structure in directing alkane reactivity.
  • To achieve selective C-H activation and dehydrogenative coupling.

Main Methods:

  • Utilizing an anisotropic gold(110) surface, which reconstructs into nanometer-sized channels upon adsorption and annealing of long-chain alkanes (>C(20)).
  • Employing intermediate temperatures (420–470 K) to facilitate the reaction.
  • Analyzing the selectivity of C-H activation and C-C bond formation.

Main Results:

  • The reconstructed gold surface creates one-dimensional channels (1.22 nm width), confining reactant molecules.
  • This confinement leads to highly selective C-H activation exclusively at terminal CH(3) or penultimate CH(2) groups.
  • Dehydrogenative C-C coupling occurs predictably, favoring aliphatic C-H bonds over aromatic ones.

Conclusions:

  • The study demonstrates a novel surface-mediated approach for selective alkane C-C coupling.
  • The anisotropic gold(110) surface acts as a template, controlling molecular orientation and reaction site selectivity.
  • This method provides a predictable pathway for functionalizing inert saturated hydrocarbons.