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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Radical Formation: Overview01:03

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
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On-Surface Synthesis of Nonbenzenoid PAHs Using Intermolecular π-Radical C-C Coupling.

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On-surface synthesis advances with π-radical coupling, enabling regioselective carbon-carbon coupling for novel nanomaterials. This method efficiently forms complex polycyclic aromatic hydrocarbons (PAHs) without direct surface catalysis.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • On-surface synthesis is crucial for low-dimensional carbon nanomaterials.
  • Understanding reaction mechanisms is key to designing selective on-surface reactions.
  • π-radical-mediated reactions are underexplored in on-surface synthesis.

Purpose of the Study:

  • To demonstrate π-radical-mediated reactions as an efficient mechanism for regioselective C-C coupling.
  • To facilitate the formation of complex nonbenzenoid polycyclic aromatic hydrocarbons (PAHs).
  • To bridge the gap between in-solution radical chemistry and on-surface synthesis.

Main Methods:

  • Utilizing π-radical coupling for dimerization of π-expanded acenaphthene units.
  • Investigating reaction mechanisms on a gold surface.
  • Analyzing the formation of nonbenzenoid PAHs.

Main Results:

  • Demonstrated regioselective C-C coupling via π-radical dimerization.
  • Successfully synthesized complex nonbenzenoid PAHs.
  • Showcased a reaction where the C-C coupling step occurs without direct gold surface catalysis.

Conclusions:

  • π-radical coupling is an efficient strategy for on-surface synthesis of complex PAHs.
  • Mechanistic insights advance the understanding of on-surface reactions.
  • This approach holds potential for expansion to inert surfaces with suitable π-radical activation.