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Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

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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.
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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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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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Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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Recent Advances in Functionalizations of Helicene Backbone.

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Chiral polyaromatic hydrocarbons called helicenes are gaining traction. This review details recent advances in helicene functionalization, overcoming challenges to unlock tailored derivatives for new applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Helicenes, a class of chiral polyaromatic hydrocarbons, exhibit unique photophysical and electronic properties.
  • Their complex, rigid helical structure presents significant challenges for chemical modification.
  • Limited functionalization routes have historically restricted the development of tailored helicene derivatives for advanced applications.

Purpose of the Study:

  • To review and highlight recent breakthroughs in the functionalization of helicene skeletons.
  • To provide an overview of diverse chemical transformations applicable to helicenes.
  • To discuss the versatility and regioselectivity of these functionalization methods.

Main Methods:

  • Comprehensive literature review of recent advancements in helicene chemistry.
  • Categorization of functionalization strategies based on reaction types.
  • Analysis of regioselectivity and scope of reported transformations.

Main Results:

  • Significant progress has been made in developing new methods for helicene functionalization.
  • A variety of transformations, including C-H activation and cross-coupling reactions, have been successfully applied.
  • Understanding regioselectivity is crucial for controlling the properties of functionalized helicenes.

Conclusions:

  • Recent functionalization strategies have overcome previous limitations in helicene chemistry.
  • These advancements enable the synthesis of precisely engineered helicene derivatives.
  • Expanded access to functionalized helicenes will drive innovation in materials science and molecular electronics.