Journal
GREEN CHEMISTRY
Volume 8, Issue 8, Pages 717-726Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b603494b
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Polymeric monoliths containing TADDOL subunits have been prepared by polymerization of the corresponding functional monomers. Treatment with TiX4 species affords Ti-TADDOLates, which can be used sequentially for two different reactions, namely the Diels-Alder reaction and the ZnEt2 addition to benzaldehyde. These monolithic materials allow working either in batch or under flow conditions. The Diels-Alder reaction is carried out more efficiently in batch that under flow conditions, but the opposite is found for the ZnEt2 addition. Enantioselectivities obtained compare well with those for other related supported systems. In some cases ee values found for the polymer-bound system are higher than those for the homogeneous analogue. The supported Ti-catalysts show an extraordinary long-term stability, being active for at least one year.
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