Abstract
Soluble polymer supported TADDOLs have been prepared by copolymerising the styryl derivative of TADDOL with styrene or N-isopropylacrylamide, NIPAAm, and the efficiency of their complexes with Ti(IV) as catalysts in enantioselective addition of Et 2Zn to benzaldehyde in toluene is reported. The copolymer with styrene gave very high yield (>90%) and excellent enantioselectivity, 98% ee, while the copolymer with NIPAAm afforded a slightly lower yield (55%), but a very high ee (90%).
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