Journal
CRYSTENGCOMM
Volume 11, Issue 3, Pages 404-407Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b821415h
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Funding
- Deutsche Forschungsgemeinschaft [DFG, SPP 1179]
- Fonds der Chemischen Industrie
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Ball milling was employed in order to study the phase behaviour of the proline-catalysed aldol reaction between solely solid substrates under solvent-free conditions. A significant nonlinear relationship between the enantiomeric excess of the catalyst (proline) and that of the aldol product was observed. The nature of this nonlinear effect originated from the ternary phase behaviour of scalemic proline. Significant differences were detected between reactions in which a mixture of either (S)- proline and (R)- proline or rac-proline and (S)- proline was employed.
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