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Stability of Substituted Cyclohexanes02:30

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
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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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Computational Investigation of 4‑Nitrophenol Inclusion Complexes with α‑, β‑, and γ‑Cyclodextrins.

Laura Fernanda Osmari Vendrame1, Mariana Zancan Tonel1, João Augusto Pereira da Rocha2

  • 1Universidade Franciscana, Rua dos Andradas, 1614, Santa Maria, RS 97010-100, Brazil.

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Cyclodextrins (CDs) show promise for removing emerging contaminants like 4-nitrophenol (4-NP) from water. Alpha-cyclodextrin (α-CD) demonstrated the strongest binding affinity and stability with 4-NP in theoretical studies.

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Area of Science:

  • Environmental Chemistry
  • Supramolecular Chemistry
  • Computational Chemistry

Background:

  • Emerging contaminants like 4-nitrophenol (4-NP) in aquatic environments present significant environmental and public health risks.
  • Cyclodextrins (CDs) are biodegradable, low-toxicity molecular hosts with potential for capturing organic micropollutants, but a comparative theoretical analysis of their interaction with 4-NP is needed.

Purpose of the Study:

  • To theoretically compare the formation and stability of inclusion complexes between 4-nitrophenol (4-NP) and three types of cyclodextrins: alpha-CD (α-CD), beta-CD (β-CD), and gamma-CD (γ-CD).
  • To provide molecular-level insights into host-guest interactions for optimizing environmental remediation strategies.

Main Methods:

  • Utilized a combination of molecular docking, molecular dynamics simulations, and ab initio density functional theory (DFT) calculations.
  • Assessed the binding affinity and stability of 4-NP inclusion complexes with α-CD, β-CD, and γ-CD.

Main Results:

  • Alpha-cyclodextrin (α-CD) exhibited the strongest and most stable interaction with 4-nitrophenol (4-NP).
  • Beta-cyclodextrin (β-CD) showed a significant interaction with 4-NP, while gamma-cyclodextrin (γ-CD) displayed weaker retention due to size mismatch and complementarity.
  • The study identified α-CD as the most effective cyclodextrin for 4-NP complexation.

Conclusions:

  • Cyclodextrins, particularly α-CD, are effective, biodegradable, and reusable materials for environmental remediation.
  • The findings offer theoretical support for employing cyclodextrins in sustainable and cost-effective strategies to remove 4-nitrophenol from aquatic systems.
  • Molecular-level understanding of host-guest interactions guides the selection of optimal cyclodextrins for contaminant removal.