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Stereoisomerism02:52

Stereoisomerism

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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...
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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...
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Stereoisomerism of Cyclic Compounds02:33

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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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Stereochemical Effects of Enolization01:12

Stereochemical Effects of Enolization

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The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Updated: Aug 17, 2025

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
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Stereopsis without correspondence.

Jenny C A Read1

  • 1Biosciences Institute, Newcastle University, Newcastle upon Tyne, Tyne and Wear UNE2 4HH, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|December 13, 2022
PubMed
Summary
This summary is machine-generated.

Insects possess stereopsis, a 3D vision ability previously thought exclusive to large-brained animals. Their simple visual systems achieve this through basic algorithms for essential behaviors, challenging complex theories.

Keywords:
binocular visioncomputational neuroscienceevolutionstereopsis

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Area of Science:

  • Neuroscience
  • Comparative Vision
  • Insect Behavior

Background:

  • Stereopsis, or 3D vision, was traditionally believed to require large brains.
  • The discovery of stereopsis in insects challenged existing theories on visual processing complexity.

Purpose of the Study:

  • To investigate how insects with simple brains achieve stereopsis.
  • To re-evaluate anthropomorphic assumptions about the requirements for stereoscopic vision.

Main Methods:

  • Analysis of insect visual processing mechanisms.
  • Comparison of insect stereopsis with human and other animal models.
  • Examination of insect behaviors driven by stereoscopic cues.

Main Results:

  • Insect stereopsis evolved for simple behaviors like object orientation and prey capture.
  • Effective stereoscopic algorithms do not require binocular fusion or stereo correspondence.
  • Insect stereopsis employs basic algorithms sufficient for species-specific survival.

Conclusions:

  • Insect stereopsis demonstrates that complex 3D vision can be achieved with simple neural mechanisms.
  • Rethinking stereopsis requirements opens possibilities for bio-inspired autonomous systems.
  • Insect stereopsis provides a model for efficient, specialized 3D visual processing.