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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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.
Selection Rules: Photochemical Activation
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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 para...
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Postcomplexation synthetic routes to dipyrrin complexes.

David Perl1, Sean W Bisset, Shane G Telfer

  • 1MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand. s.telfer@massey.ac.nz.

Dalton Transactions (Cambridge, England : 2003)
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

A new postfunctionalization method allows for the synthesis of diverse dipyrrin metal complexes. This approach uses a methylthio-substituted ligand and nucleophilic displacement, enabling access to previously difficult-to-make rhenium(I) complexes.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Synthetic Chemistry

Background:

  • Dipyrrin ligands are versatile building blocks in coordination chemistry.
  • Traditional synthetic routes to functionalized dipyrrin complexes can be limited.
  • Accessing novel metal complexes with specific functionalities is crucial for materials science and catalysis.

Purpose of the Study:

  • To develop a novel postfunctionalization strategy for dipyrrin metal complexes.
  • To demonstrate the broad applicability of this method for synthesizing new complexes.
  • To utilize rhenium(I) as a platform for showcasing the synthetic utility of the new route.

Main Methods:

  • Coordination of a 5-methylthiodipyrrinato ligand to a metal center.
  • Nucleophilic displacement of the thiomethyl group on the coordinated ligand.
  • Utilizing amine nucleophiles with rhenium(I) complexes.

Main Results:

  • A versatile postfunctionalization synthetic route to dipyrrin complexes was established.
  • A broad range of new dipyrrin complexes were successfully synthesized.
  • Complexes difficult or impossible to access via traditional methods were obtained using rhenium(I) and amine nucleophiles.

Conclusions:

  • The reported postfunctionalization strategy offers a powerful new tool for dipyrrin complex synthesis.
  • This method significantly expands the scope of accessible dipyrrin metal complexes.
  • The approach is particularly valuable for creating functionalized rhenium(I) complexes.