“…Using Procedure B, 3-chlorobenzylamine (1.01 g, 7.1 mmol) was condensed with 3-chlorobenzaldehyde (1.00 g, 7.1 mmol) to furnish 3-chlorobenzylidene-3-chlorobenzylamine 31 (1.78 g, 95%) as a yellow oil [δ H (CDCl 3 ) 4.79 (2H, s), 7.16-7.57 (6H, m), 7.64 (1H, d, J 9), 7.87 (1H, s), 8.33 (1H, s)], which was reduced to afford bis(3-chlorobenzyl)amine 33 (1.60 g, 90%) as a yellow oil [δ H (CDCl 3 ) 3.76 (4H, s), 7.17 a Equimolar quantities of the pseudorotaxanes' constituents were dissolved in a small amount of the solvent (in which all species are totally soluble), then the precipitant was layered on top of the resulting solution carefully. X-ray quality crystals were obtained after several days, when the precipitant had diffused into the solution completely.…”