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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

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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Nomenclature of Alkynes02:39

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes


The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.

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Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
12:27

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Published on: September 8, 2013

Aryne insertion into I-I σ-bonds.

Diego Rodríguez-Lojo1, Agustín Cobas, Diego Peña

  • 1Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), and Departamento de Química Orgánica, Universidade de Santiago, 15782 Santiago de Compostela, Spain.

Organic Letters
|March 10, 2012
PubMed
Summary

A novel protocol efficiently synthesizes challenging ortho-diiodoarenes using aryne insertion into the iodine-iodine bond. This method expands access to complex substituted and polycyclic aromatic compounds.

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Area of Science:

  • Organic Chemistry
  • Synthetic Methodology

Background:

  • Ortho-diiodoarenes are valuable synthetic intermediates.
  • Classical methods struggle to synthesize substituted and polycyclic variants.

Purpose of the Study:

  • To develop an efficient protocol for synthesizing ortho-diiodoarenes.
  • To enable the preparation of complex substituted and polycyclic ortho-diiodoarenes.

Main Methods:

  • Aryne intermediates are generated in situ.
  • Arynes undergo formal insertion into the I-I sigma bond of molecular iodine.

Main Results:

  • A new, efficient synthesis of ortho-diiodoarenes is established.
  • The protocol successfully synthesizes substituted and polycyclic ortho-diiodoarenes.
  • This method overcomes limitations of classical synthetic approaches.

Conclusions:

  • The developed protocol provides a versatile route to diverse ortho-diiodoarenes.
  • This methodology broadens the scope of accessible organoiodine compounds.
  • The reaction mechanism involves aryne formal insertion into the I-I bond.