A new type of arylamido ligands with an intramolecular coordinating ortho-ether-substituent (i.e. a O,N - chelating ligand) is introduced. The achiral and chiral 4-coordinate dimethyl aluminium complexes [2-ROC 6 H 4 NR']AlMe 2 (4a: R=R'=Cy; 4b: R=(-)-menthyl, R'=Cy, 4c: R=(-)-menthyl, R'=CPh 3 ) have been prepared by reaction of the appropriate amido Li salt with ClAlMe 2 . Complex 4a could also be obtained, via methane elimination, by reaction of AlMe 3 with the corresponding ligand. The presence of two rotamers in solution at room temperature for 4b and for 4c is most likely due to a restricted rotation of the (-)-menthyl group at this temperature due to severe steric interactions with the rest of the complex.