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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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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
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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.
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Upper Critical Solution Temperature-Type Responsive Cyclodextrins with Characteristic Inclusion Abilities.

Li Zhu1, Kun Liu1, Shudong Zheng1

  • 1International Joint Laboratory of Biomimetic and Smart Polymers, School of Materials Science and Engineering, Shanghai University, Materials Building Room 801, Nanchen Street 380, Shanghai, 200444, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 19, 2021
PubMed
Summary
This summary is machine-generated.

Novel ureido-substituted cyclodextrins (CDs) exhibit unique upper critical solution temperature (UCST) behavior, forming coacervates upon cooling. These smart macrocycles maintain guest inclusion during phase transitions, enabling stimuli-responsive materials.

Keywords:
FRETcyclic saccharidehost-guest interactionsthermoresponsivenessupper critical solution temperature

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Stimuli-responsive supramolecular materials require water-soluble macrocycles with stable guest inclusion.
  • Thermoresponsive polymers often exhibit lower critical solution temperature (LCST) behavior, leading to switchable host-guest interactions.

Purpose of the Study:

  • To develop novel ureido-substituted cyclodextrins (CDs) with upper critical solution temperature (UCST) behavior.
  • To investigate the stimuli-responsive properties and host-guest complexation of these novel CDs.

Main Methods:

  • Synthesis of ureido-substituted cyclodextrins.
  • Characterization of UCST behavior in aqueous media.
  • Investigation of host-guest binding with guest dyes.
  • Analysis of inclusion complex stability during thermal phase transitions.

Main Results:

  • Ureido-substituted CDs exhibit unprecedented UCST behavior, collapsing into coacervates upon cooling.
  • Cloud points are tunable via concentration, oxidation, and silver ion chelation.
  • Stable host-guest inclusion complexes are maintained during UCST-induced phase transitions.
  • Co-encapsulation of dyes allows for fluorescence resonance energy transfer (FRET) switching controlled by the UCST transition.

Conclusions:

  • Novel ureido-substituted CDs offer a new strategy for designing smart macrocycles with stable inclusion properties.
  • These materials enable the development of advanced stimuli-responsive supramolecular systems.
  • The UCST behavior provides a unique platform for switchable host-guest interactions and FRET applications.