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Related Concept Videos

Fischer Projections02:18

Fischer Projections

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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Prochirality02:05

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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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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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Related Experiment Video

Updated: Aug 3, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Tröger's Base-Based Cuboid Constructed by Chiral Self-Discrimination.

Conghao Shi1, Pengbo Niu1, Wang Xie1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P.R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 11, 2023
PubMed
Summary

Researchers developed a transformable cuboid crystal material using a chiral macrocycle. This novel structure demonstrates significant iodine adsorption capabilities, showing potential for iodine capture applications.

Keywords:
Tröger's basesadsorptionchiral self-discriminationcrystal materialscuboidsiodine

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Area of Science:

  • Materials Chemistry
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Cuboid structures offer unique shapes, enhanced stability, and improved material performance in chemistry.
  • Chiral macrocycles are valuable building blocks for creating complex supramolecular architectures.

Purpose of the Study:

  • To design and synthesize a novel, transformable cuboid-stacking crystal material.
  • To investigate the material's response to external stimuli, specifically iodine vapor.
  • To evaluate the material's capacity for iodine adsorption.

Main Methods:

  • Synthesis of a chiral macrocycle (TBBP) based on Tröger's base (TB) and benzophenone (BP).
  • Construction of a cuboid-stacking crystal material using TBBP.
  • Characterization of structural changes using single-crystal X-ray diffraction (SCXRD) and powder X-ray diffraction (PXRD).

Main Results:

  • A novel, transformable cuboid-stacking crystal material was successfully constructed.
  • The material exhibited significant structural transformation upon exposure to iodine vapor.
  • An exceptionally high iodine adsorption capacity of 3.43 g/g was achieved.

Conclusions:

  • The developed Tröger's base-based cuboid material is transformable and shows excellent iodine adsorption properties.
  • This material holds promise for applications in iodine capture and separation technologies.
  • The strategy of using self-discrimination for cuboid construction offers a new route for designing functional crystal materials.