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Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
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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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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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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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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Reactive Intermediates and Unusual Molecules: 70 Years with Fascinating Chemistry.

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Summary

This research explores reactive intermediates and unusual molecules, synthesizing novel compounds and developing advanced spectroscopic equipment for their detailed chemical and physical analysis. The study highlights the creation and characterization of various organic and inorganic species.

Keywords:
carbenescyanatesfulminatesnitrenesnitrile imines

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Area of Science:

  • Organic Chemistry
  • Inorganic Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Early work involved amateur rocket propellants, leading to investigations of highly sensitive compounds.
  • Research extended to cyanates (ROCN), fulminates (XCNO), and their isomers (CHNO, CRNO).

Purpose of the Study:

  • To detail the synthesis and spectroscopic investigation of reactive intermediates and unusual molecules.
  • To develop specialized equipment for studying transient chemical species.

Main Methods:

  • Flash vacuum pyrolysis
  • Matrix isolation and photolysis
  • Spectroscopic techniques including Infrared (IR), Ultraviolet (UV), Electron Spin Resonance (ESR), Mass Spectrometry (MS), Microwave (MW), and Photoelectron Spectroscopy (PES)

Main Results:

  • Detailed chemical and spectroscopic characterization of numerous reactive intermediates, including nitrenes, carbenes, nitrile imines, ketenes, and sulfur-nitrogen compounds.
  • Development of integrated equipment combining flash vacuum pyrolysis with IR, UV, ESR, and MS for in-situ analysis.
  • Synthesis and characterization of novel compounds like HCN dimers and various sulfur-containing molecules.

Conclusions:

  • Established comprehensive methods for generating and characterizing highly reactive and unusual chemical species.
  • Advanced the understanding of the structure and properties of transient molecules through detailed spectroscopic analysis.
  • Paved the way for further research into reactive intermediates and the development of novel synthetic methodologies.