[reaction: see text] Hetero-Diels-Alder reactions of Brassard diene with aromatic aldehydes were carried out smoothly in the presence of titanium(IV) tridentate Schiff base complexes to give the corresponding chiral delta-lactones in high enantioselectivities (up to 99% ee) under mild conditions.
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Fan et al. (2004) studied this question.
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