Substituted 4-alk­oxy-7-Cl-quinolines exhibiting [pi]-[pi] stacking

The mol­ecules of 4-all­yloxy-7-chloro­quinoline, C₁₂H₁₀ClNO, (I), 7-chloro-4-meth­oxy­quinoline, C₁₀H₈ClNO, (II), and 7-chloro-4-eth­oxy­quinoline, C₁₁H₁₀ClNO, (III), are all planar. In all three structures, [pi]-[pi] inter­actions between the quinoline ring systems are generated by unit-cell translations along the a axes, irrespective of space group. These structures are the first reported for 4-alk­oxy­quinolines.