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Related Concept Videos

Racemic Mixtures and the Resolution of Enantiomers02:30

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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...
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Optical Resolution by Preferential Crystallization of (RS)-2-Amino-3-(2-carboxyethylthio)propanoic Acid.

T Shiraiwa1, M Kubo1, M Watanabe1

  • 1a Faculty of Engineering and High Technology Research Center, Kansai University.

Bioscience, Biotechnology, and Biochemistry
|July 10, 2016
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel amino acid derivatives, (RS)- and (R)-2-amino-3-(2-carboxyethylthio)propanoic acids (ACE), via electrophilic addition. The study details the conglomerate nature of (RS)-ACE and its successful optical resolution to obtain pure (R)- and (S)-ACE enantiomers.

Keywords:
conglomerateoptical resolutionoptically active 2-amino-3-(2-carboxyethylthio)propanoic acidpreferential crystallization

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Area of Science:

  • Organic Chemistry
  • Stereochemistry
  • Biochemistry

Background:

  • Cysteine (Cys) is a crucial amino acid with a thiol group.
  • Propenoic acid is a simple unsaturated carboxylic acid.
  • The synthesis of novel amino acid derivatives can expand biochemical understanding.

Purpose of the Study:

  • To synthesize novel cysteine-derived amino acids through electrophilic addition.
  • To characterize the stereochemical properties of the synthesized compounds.
  • To develop a method for obtaining optically pure enantiomers.

Main Methods:

  • Electrophilic addition reaction between DL- and L-Cysteine and propenoic acid.
  • Characterization of synthesized (RS)-2-amino-3-(2-carboxyethylthio)propanoic acid (ACE) using melting point, solubility, and infrared spectroscopy.
  • Optical resolution of (RS)-ACE via preferential crystallization.
  • Recrystallization of resolved (R)- and (S)-ACE from water.

Main Results:

  • Synthesis of (RS)- and (R)-2-amino-3-(2-carboxyethylthio)propanoic acids (ACE) was achieved.
  • (RS)-ACE was identified as a conglomerate, indicating a mixture of enantiomers.
  • Preferential crystallization successfully resolved (RS)-ACE into its (R)- and (S)-enantiomers.
  • Optically pure (R)- and (S)-ACE were obtained through efficient recrystallization.

Conclusions:

  • The study successfully synthesized and characterized novel ACE derivatives.
  • A viable method for the optical resolution of racemic ACE was established.
  • The findings contribute to the understanding of cysteine chemistry and stereoselective synthesis.