The present invention relates to aromatic compounds of the formula I wherein Ar is phenyl or an aromatic 5- or 6-membered C-bound heteroaromatic radical, wherein Ar may carry 1 radical Ra and wherein Ar may also carry 1 or 2 radicals Rb; X is N or CH; Y is O, S, —CH═N—, —CH═CH— or —N═CH—; A is CH2, O or S; E is CR6R7 or NR3; R1 is C1-C4-alkyl, C3-C4-cycloalkyl, C3-C4-cycloalkylmethyl, C3-C4-alkenyl, fluorinated C1-C4-alkyl, fluorinated C3-C4-cycloalkyl, fluorinated C3-C4-cycloalkylmethyl, fluorinated C3-C4-alkenyl, formyl or C1-C3-alkylcarbonyl; R1a is H, C2-C4-alkyl, C3-C4-cycloalkyl, C3-C4-alkenyl, fluorinated C1-C4-alkyl, fluorinated C3-C4-cycloalkyl, or R1a and R2 together are (CH2)n with n being 2 or 3, or R1a and R2a together are (CH2)n with n being 2 or 3; R2 and R2a are independently of each other H, CH3, CH2F, CHF2 or CF3; R3 is H or C1-C4-alkyl; R6, R7 independently of each other are selected from H, C1-C2-alkyl and fluorinated C1-C2-alkyl; and the physiologically tolerated acid addition salts thereof. The invention also relates to the use of a compound of the formula I or a pharmaceutically acceptable salt thereof for preparing a pharmaceutical composition for the treatment of a medical disorder susceptible to treatment with a dopamine D3 receptor ligand.