X-ray analyses of compounds 11Ff, 17, and 11Af · HCl were performed. The bicyclic and tricycliccompounds were used as chiralligands in the reaction of diethylzinc with aldehydes 19, in particular with benzaldehyde (19a). Using bicycliccompounds with a tertiary β-hydroxyalkyl substitutent at the N atom as ligands, ee's in the range of 78 to 95% were found. Whereas for the best ligands 11Ae and Af the