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Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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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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Cycloalkanes

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Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
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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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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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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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Highly Soluble Cyclic Organoalanes Based on Anionic Dicarbenes.

Arne Merschel1, Yury V Vishnevskiy1, Beate Neumann1

  • 1Molecular Inorganic Chemistry and Catalysis, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 9, 2023
PubMed
Summary

New cyclic organoalane compounds featuring anionic dicarbene frameworks were synthesized. These stable compounds exhibit reactivity with carbon dioxide and isocyanates, showcasing their potential in organometallic chemistry.

Keywords:
aluminiumanionic dicarbenecarbon dioxideheterocyclehydrides

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry

Background:

  • Anionic dicarbene (ADC) frameworks offer unique structural and electronic properties.
  • Organoalane compounds are versatile reagents in synthesis.

Purpose of the Study:

  • To synthesize and characterize novel cyclic organoalane compounds based on ADC frameworks.
  • To investigate the reactivity of these organoalanes with electrophilic reagents like CO2 and isocyanates.

Main Methods:

  • Synthesis of cyclic organoalanes via reaction of Li(ADCAr) with LiAlH4.
  • Characterization using NMR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction.
  • Reactivity studies involving carbon dioxide, isocyanates, and isothiocyanates.

Main Results:

  • Stable, crystalline cyclic organoalane compounds [(ADCAr)AlH2]2 were successfully synthesized.
  • These compounds feature an annulated tricyclic structure with a central Al2-core.
  • Reactions with CO2 yielded hydroalumination products, and reactions with isocyanates/isothiocyanates were also demonstrated.

Conclusions:

  • The synthesized cyclic organoalanes are stable and soluble, offering a new class of organometallic compounds.
  • Their reactivity with CO2, isocyanates, and isothiocyanates highlights their potential as synthetic intermediates.
  • The structural and reactivity studies provide valuable insights into organoalane chemistry.