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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.3K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.1K
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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Synthesis of Mixed-Functionalized Tetraacylgermanes.

Sabrina D Püschmann1, Philipp Frühwirt2, Michael Pillinger1

  • 1Institute of Inorganic Chemistry, Technical University Graz, Stremayrgasse 9/IV, 8010, Graz, Austria.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 9, 2020
PubMed
Summary

New nonsymmetric tetraacylgermanes were synthesized, showing improved solubility and photoactivity. These compounds are efficient photoinitiators, especially for applications needing deep light penetration.

Keywords:
acylationgermanesgermaniumphotochemistryphotoinitiators

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Tetraacylgermanes are established as effective photoinitiators.
  • Nonsymmetric substitution patterns in such compounds are less explored.

Purpose of the Study:

  • To synthesize novel mixed tetraacylgermanes with nonsymmetric substitution.
  • To investigate their solubility, photoactivity, and potential as photoinitiators.

Main Methods:

  • Synthesis of mixed tetraacylgermanes using germenolates as intermediates.
  • Characterization via elemental analysis, IR, NMR, CIDNP, UV/Vis spectroscopy, photolysis, and X-ray crystallography.
  • Evaluation of photoactivity and photobleaching properties.

Main Results:

  • Successfully synthesized mixed tetraacylgermanes with enhanced solubility and broadened n-π* absorption bands.
  • Demonstrated efficient photobleaching at wavelengths above 450 nm using a 470 nm LED.
  • Achieved quantum yields ranging from 0.15 to 0.57.
  • CIDNP data indicated preferential addition of generated germyl radicals to butyl acrylate monomers.
  • Differential α-cleavage observed between compound series 4a-c and 6a-e.

Conclusions:

  • Mixed-functionalized tetraacylgermanes are superior photoinitiators due to improved solubility and photoactivity.
  • Their enhanced absorption characteristics make them suitable for applications requiring high penetration depth.
  • The specific cleavage patterns offer tunable reactivity for different polymerization processes.