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Speeding up Viedma ripening.

Anthonius H J Engwerda1, Hugo Meekes1, Bernard Kaptein2

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Viedma ripening accelerates the conversion of solid racemates into single enantiomers. This method significantly reduces deracemization time for amino acid derivatives from days to hours.

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Area of Science:

  • Chiral chemistry
  • Crystallization science
  • Organic synthesis

Background:

  • Racemates exist as either racemic compounds or conglomerates.
  • Viedma ripening is a crystallization technique that converts metastable racemic compounds into conglomerates.
  • Conglomerates can be more easily separated into single enantiomers.

Purpose of the Study:

  • To investigate the application of Viedma ripening for accelerated deracemization.
  • To evaluate the efficiency of Viedma ripening for amino acid derivatives.
  • To compare the deracemization speed using Viedma ripening versus traditional methods.

Main Methods:

  • Solid-state Viedma ripening was employed.
  • The process involved the gradual conversion of a metastable racemic compound into a conglomerate.
  • Two amino acid derivatives were used as model systems.

Main Results:

  • Viedma ripening successfully facilitated the conversion of solid racemates into single enantiomers.
  • The deracemization process was significantly accelerated.
  • The conversion time was reduced from several days to a few hours for the tested amino acid derivatives.

Conclusions:

  • Viedma ripening offers a highly efficient method for rapid deracemization of solid racemates.
  • This technique provides a substantial improvement in speed compared to conventional methods.
  • The findings highlight the potential of Viedma ripening in chiral chemistry and enantioselective synthesis.