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In the title molecule, C 18 H 21 Cl 2 N 3 , the triazacyclohexane ring adopts a chair conformation with both 4-chlorophenyl substituents in axial positions and the propyl group in an equatorial site. The dihedral angle between the planes of the benzene rings is 49.5 (1) . In the crystal, molecules are arranged in a head-to-tail fashion, forming columns along [010], and pairs of weak C-HÁ Á Á interactions form inversion dimers between columns.Keywords: crystal structure; triazacyclohexane; C-HÁ Á Á interactions.

In the main mol­ecule of the title compound, C21H18Br3N3·CH2Cl2, the triazinane ring adopts a chair conformation with three 4-brom­ophenyl substituents, two in diaxial positions and the third in an equatorial arrangement (eaa). The torsion angles around the N—C bonds in the triazinane ring are in the range 55.6 (5)–60.1 (5)°. The structure can be described as being built up of alternating layers along the b axis with the CH2Cl2 solvent mol­ecules sandwiched between these layers. No classical hydrogen-bonding inter­actions are observed in the crystal structure.

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