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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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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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Structure of Conjugated Dienes01:16

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Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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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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Diarylethene-Based Ionic Liquids: Synthesis and Photo-Driven Solution Properties.

Mário R C Soromenho1, Carlos A M Afonso2, José M S S Esperança1

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International Journal of Molecular Sciences
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel photochromic gemini diarylethene-based ionic liquids (GDILs). These GDILs exhibit tunable water solubility and photo-responsive conductivity, offering new possibilities for photoswitchable materials.

Keywords:
diaryletheneionic liquidsphoto-driven propertiesphotochromic salts

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Photochromic materials change color upon light exposure.
  • Ionic liquids (ILs) are salts with low melting points, offering unique solvent properties.
  • Diarylethene-based ionic liquids (GDILs) combine photochromism with ionic liquid characteristics.

Purpose of the Study:

  • To design and synthesize novel photochromic gemini diarylethene-based ionic liquids (GDILs).
  • To investigate the impact of different cationic motifs on GDIL properties, including water solubility and photochromism.
  • To explore the photo-responsive physicochemical properties of GDILs in aqueous and IL solutions.

Main Methods:

  • Synthesis of GDILs via N-alkylation of a photochromic core with various tertiary amines.
  • Optimization of synthetic pathways for cationic GDILs with chloride counterions.
  • Investigation of physicochemical properties (conductivity, solubility) in aqueous and IL solutions under UV irradiation.

Main Results:

  • Novel GDILs with varying cationic motifs and chloride counterions were successfully synthesized.
  • These GDILs exhibit significant water solubility and unique photochromic behaviors.
  • UV irradiation induced changes in conductivity in aqueous GDIL solutions, while IL solutions showed varied responses.
  • The properties of non-ionic and ionic liquids can be modulated by adding these GDILs and using UV light.

Conclusions:

  • The synthesized GDILs offer tunable properties based on their cationic structure.
  • These photochromic ionic liquids demonstrate potential for creating stimuli-responsive materials.
  • The ability to alter solution properties via UV light opens avenues for advanced applications in photoswitchable systems.