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Related Concept Videos

Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
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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.
Ion Exchange01:17

Ion Exchange

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 basic...
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes


The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
Ion-Exchange Chromatography01:09

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Hemicryptophane host as efficient primary alkylammonium ion receptor.

Olivier Perraud1, Sara Lefevre, Vincent Robert

  • 1Laboratoire de Chimie, CNRS, École Normale Supérieure de Lyon, 46, Allée d'Italie, F-69364, Lyon, France.

Organic & Biomolecular Chemistry
|December 14, 2011
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Hemicryptophane 3 demonstrates superior binding affinity for primary alkylammonium ions, significantly outperforming previous hosts. This selectivity makes it a promising candidate for complexing neurotransmitters like dopamine.

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Area of Science:

  • Supramolecular Chemistry
  • Host-Guest Chemistry
  • Computational Chemistry

Background:

  • Hemicryptophane molecules are known for their ability to encapsulate guest molecules.
  • Developing selective receptors is crucial for applications in sensing and separation.
  • Previous hemicryptophane hosts showed moderate binding affinities for certain guests.

Purpose of the Study:

  • To synthesize and characterize a novel hemicryptophane host, Hemicryptophane 3.
  • To evaluate the binding efficiency and selectivity of Hemicryptophane 3 for primary alkylammonium ions.
  • To explore the potential of Hemicryptophane 3 in neurotransmitter complexation.

Main Methods:

  • Synthesis of Hemicryptophane 3.
  • Binding studies using various primary alkylammonium ions.
  • Spectroscopic and crystallographic analyses.
  • Density functional theory (DFT) calculations.

Main Results:

  • Hemicryptophane 3 exhibited significantly enhanced binding constants (1000-fold higher) for primary alkylammonium ions compared to previously reported hosts.
  • The host demonstrated high selectivity for these guests.
  • Efficient complexation of dopamine was observed, indicating potential for neurotransmitter applications.
  • DFT calculations revealed key host-guest interactions and complementarities.

Conclusions:

  • Hemicryptophane 3 is a highly efficient and selective receptor for primary alkylammonium ions.
  • Its strong binding affinity and selectivity suggest utility in complexing biologically relevant molecules, such as neurotransmitters.
  • Computational insights support the observed binding behavior and highlight design principles for future receptors.