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Related Concept Videos

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

Polymer Classification: Stereospecificity

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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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Stereoisomers02:32

Stereoisomers

13.1K
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...
13.1K
Racemic Mixtures and the Resolution of Enantiomers02:30

Racemic Mixtures and the Resolution of Enantiomers

18.5K
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
18.5K
Prochirality02:05

Prochirality

3.8K
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...
3.8K
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

17.2K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
17.2K

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Recent advances in enhancing stereocomplexation between poly(lactide) enantiomeric chains.

Mingwei Guo1, Weixin Wu1, Wenjing Wu1

  • 1College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China. guomw199876@163.com.

Physical Chemistry Chemical Physics : PCCP
|July 3, 2023
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Summary

Stereocomplexation of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) enhances poly(lactide) (PLA) properties. This review details methods to improve stereocomplex (SC) crystallization in PLA-based materials for broader applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials Engineering

Background:

  • Poly(lactide) (PLA) is explored for biomedical and industrial uses due to biodegradability and biocompatibility.
  • PLA homopolymers exhibit limitations: poor mechanical properties, low thermal stability, and insufficient crystallinity.
  • Stereocomplexation (SC) between enantiomeric poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) offers a route to overcome these limitations.

Purpose of the Study:

  • To review recent advancements in improving SC crystallization of PLA-based plastics.
  • To focus on enhancing SC crystallization through improved interactions in enantiomeric PLA-based copolymers.
  • To provide a foundational understanding of SC crystallization mechanisms for developing advanced PLA materials.

Main Methods:

  • Summarizing progress in SC crystallization of enantiomeric PLA homopolymers and copolymers.
  • Analyzing the effect of enhanced SC crystallization and intermolecular interactions between PLLA and PDLA.
  • Discussing rational mechanisms for improved SC crystallization.

Main Results:

  • Stereocomplexation significantly improves the properties of PLA-based materials.
  • Enhanced interactions in enantiomeric PLA-based copolymers are key to improving SC crystallization.
  • Understanding SC crystallization mechanisms facilitates the development of high-performance PLA materials.

Conclusions:

  • Stereocomplexation is a crucial strategy for enhancing PLA properties.
  • Targeting intermolecular interactions in copolymers is vital for optimizing SC crystallization.
  • This review provides insights into advancing PLA-based materials for diverse applications.