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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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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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Recent Advances in Metallaaromatic Chemistry.

Benjamin J Frogley1, L James Wright1

  • 1School of Chemical Sciences, University of Auckland, Private Bag, 92019, Auckland, New Zealand.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 2, 2017
PubMed
Summary

Metallaaromatics, featuring transition metals in aromatic rings, include diverse structures like metallabenzenes and novel aromatic metallapentalenes. These compounds offer fundamental chemical insights and potential practical applications.

Keywords:
aromaticityheterocyclesmetallabenzynemetallacyclestransition metals

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Area of Science:

  • Organometallic Chemistry
  • Aromaticity Studies

Background:

  • Metallaaromatics are aromatic compounds with a transition metal in the ring.
  • Metallabenzenes and related species are actively researched.
  • Some metallaaromatics challenge traditional aromaticity concepts.

Purpose of the Study:

  • To review key features of diverse metallaaromatic compounds.
  • To highlight structural, spectroscopic, and reactivity aspects.
  • To discuss theoretical studies and potential applications.

Main Methods:

  • Review of structural studies.
  • Analysis of spectroscopic data.
  • Examination of reactivity patterns.
  • Discussion of theoretical investigations.

Main Results:

  • Identification of various metallaaromatic classes (metallabenzenes, fused-ring, heterometallabenzenes, π-coordinated, metallabenzynes).
  • Demonstration of aromaticity in metallapentalenes and metallapentalynes, contrary to their organic counterparts.
  • Isolation of unique spiro-metallaaromatic compounds.
  • Compilation of structural, spectroscopic, and reactivity data.

Conclusions:

  • Metallaaromatic chemistry is a dynamic field with surprising findings.
  • These compounds expand fundamental understanding of aromaticity.
  • Potential for practical applications exists.