(rac)-4-Formyl[2.2]paracyclophane (5.00 g, 21.1 mmol, 1.0 equiv.) was dissolved in toluene (60 mL) and (R)-phenylethylamine (2.69 mL, 2.56 g, 21.1 mmol, 1.0 equiv.) was added. The solution was heated to reflux for 12 h under the removal of water using a Dean-Stark apparatus. The solvent was removed under reduced pressure.
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