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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Combining Distibene, Diazoolefins, and Visible Light: Synthesis and Reactivity of Inorganic Rings.

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Researchers developed new heavy heterocycles using antimony and diazoolefins. This breakthrough enables novel synthetic routes for heavy dipnictogen chemistry and CO2 activation.

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Area of Science:

  • Organometallic Chemistry
  • Synthetic Chemistry
  • Materials Science

Background:

  • Heterocycles with "diaza" units are well-studied for diverse applications.
  • Heterocycles containing heavy elements like antimony (Sb) and bismuth (Bi) are rare and difficult to synthesize.

Purpose of the Study:

  • To synthesize and characterize novel heavy heterocycles containing antimony.
  • To explore new synthetic methodologies for heavy dipnictogen chemistry.
  • To investigate the reactivity of these novel compounds, including CO2 activation.

Main Methods:

  • Utilized a [3 + 2]-cycloaddition reaction between a distibene and diazoolefins.
  • Conducted comprehensive experimental and theoretical investigations.
  • Employed visible-light irradiation for specific transformations.

Main Results:

  • Successfully synthesized the first diazadistiboylidenes (1a, 1b).
  • Demonstrated their utility as intermediates for selective nucleophilic substitution, yielding a diantimonyl anion.
  • Isolated the first methylenedistibiranes, heavy analogs of methylenediaziridine, via visible-light irradiation.

Conclusions:

  • Established a novel platform for heavy dipnictogen chemistry.
  • Showcased diazoolefins and visible light as key reagents for creating unprecedented heavy heterocycles.
  • Highlighted the potential of these compounds in CO2 activation.