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Related Concept Videos

Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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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The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three steps:...
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Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Prochirality02:05

Prochirality

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...
Stereoisomers02:32

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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Pseudorotaxanes with self-sorted sequence and stereochemical orientation.

Carmen Talotta1, Carmine Gaeta, Zhenhui Qi

  • 1Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Giovanni Paolo II n. 132, 84084 Fisciano (Salerno), Italy.

Angewandte Chemie (International Ed. in English)
|June 7, 2013
PubMed
Summary

This study developed a self-sorting system using partner preferences in pseudorotaxane formation. The system can distinguish molecular sequences and stereochemistry, even with subtle structural differences.

Keywords:
calixarenespseudorotaxanesself-sortingsequence isomerssuperweak anions

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Area of Science:

  • Supramolecular chemistry
  • Chemical self-assembly

Background:

  • Pseudorotaxane formation relies on molecular recognition between components.
  • Controlling the assembly of complex molecular architectures requires precise recognition mechanisms.

Purpose of the Study:

  • To develop an integrative self-sorting system for molecular discrimination.
  • To exploit partner preferences in pseudorotaxane formation for selective assembly.

Main Methods:

  • Utilized calix[6]arenes and bisammonium axles in pseudorotaxane formation.
  • Investigated selective threading and orientation based on molecular structure.

Main Results:

  • Achieved simultaneous discrimination at the sequence and stereochemical level.
  • Demonstrated selective threading of calix[6]arenes onto bisammonium axles with preferred orientation.
  • Showed effective discrimination despite small and remote structural differences between building blocks.

Conclusions:

  • Established a robust self-sorting system based on molecular recognition.
  • Highlighted the potential of pseudorotaxane formation for creating complex, ordered molecular systems.
  • Validated the system's ability to discern subtle structural variations in molecular components.