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Spontaneous Deracemizations.

Thomas Buhse1, José-Manuel Cruz2, María E Noble-Terán1

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Spontaneous deracemization uses energy input to transform achiral substances into enantioenriched forms without chiral catalysts. This review highlights recent advancements and requirements for these fascinating chemical transformations.

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Area of Science:

  • Chirality Research
  • Physical Organic Chemistry
  • Crystallography

Background:

  • Spontaneous deracemization converts achiral or racemic compounds into enantioenriched states without chiral inducers.
  • Key examples include the Soai reaction and Viedma deracemization, driven by various energy inputs.

Purpose of the Study:

  • To review recent developments in spontaneous deracemization processes.
  • To explore the physicochemical origins and symmetry requirements governing these transformations.

Main Methods:

  • Literature review of spontaneous deracemization studies.
  • Analysis of thermodynamic constraints and structural features.
  • Compilation of compounds yielding conglomerate crystals.

Main Results:

  • Diverse deracemization methods reported, including solutions, mesophases, and conglomerate crystallizations.
  • Structural features alone are insufficient to explain spontaneous deracemizations; thermodynamic constraints are crucial.
  • A list of accessible compounds forming conglomerate crystals is provided to stimulate new research.

Conclusions:

  • Spontaneous deracemization is a complex field requiring interdisciplinary approaches.
  • Understanding the physicochemical basis and symmetry is key to designing new deracemization strategies.
  • Further experimental work on suitable compounds is encouraged to advance the field.