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Related Concept Videos

Introduction to Functional Groups02:08

Introduction to Functional Groups

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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of common functional groups
The table below summarizes some of the major functional groups in...
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Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications
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[2]Rotaxane with multiple functional groups.

Subrata Saha1, Saikat Santra, Bidyut Akhuli

  • 1Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , 2A & 2B Raja S. C. Mullick Road, Kolkata 700 032, India.

The Journal of Organic Chemistry
|October 30, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized metal-templated pseudorotaxane precursors and a metal-free [2]rotaxane. A bulky stopper prevented dethreading, demonstrating kinetic inertness of the novel interlocked molecular structure.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Coordination Chemistry

Background:

  • Template-directed synthesis is crucial for constructing complex molecular architectures like rotaxanes.
  • Metal ions can act as templates to facilitate the threading of molecular components.
  • Azide-alkyne cycloaddition is a common click chemistry reaction for linking molecular units.

Purpose of the Study:

  • To synthesize metal-templated [2]pseudorotaxane precursors using Cu(II) and Ni(II) ions.
  • To develop a metal-free [2]rotaxane via a click chemistry approach.
  • To investigate the structural integrity and kinetic stability of the synthesized rotaxane.

Main Methods:

  • High-yield synthesis of Cu(II)- and Ni(II)-templated [2]pseudorotaxane precursors.
  • Single-crystal X-ray structural analysis to confirm threading and interactions.
  • Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) for rotaxane formation.
  • Mass spectrometry and 1D/2D NMR (COSY, DOSY, ROESY) for characterization.
  • Variable-temperature NMR studies to assess kinetic stability.

Main Results:

  • Successful synthesis of Cu(II)- and Ni(II)-templated [2]pseudorotaxane precursors.
  • X-ray analysis confirmed axle threading within the macrocycle, stabilized by π-π stacking and metal ion templation.
  • Attempted stopper attachment to the Cu(II) precursor failed due to dethreading.
  • A metal-free [2]rotaxane was synthesized in 45% yield by coupling the Ni(II) precursor with an alkyne-terminated stopper.
  • NMR studies confirmed the structure, location of the wheel, and kinetic inertness of the rotaxane, with the stopper preventing dethreading.

Conclusions:

  • Metal templation and π-π stacking are effective for forming pseudorotaxane precursors.
  • The developed bulky stopper enhances the kinetic stability of the metal-free [2]rotaxane.
  • The study demonstrates a viable route to functionalized, kinetically stable metal-free rotaxanes.