Abstract
The enantiomeric excess observed for the exo-adduct from the Lewis acid catalysed Diels–Alder reaction between cyclopentadiene and methacrolein can be increased up to 21% by simple modification of the electronics of the aromatic ring in a series of stilbene-derived diol ligands, suggesting that the proposed face–face π–π interaction between the catalyst and the dienophile can be modulated by altering the electron density on the aromatic ring.
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