A Convenient Access to Biquinoline Carbaldehydes using Nickel-Phosphine Complex-Mediated Homocoupling of Haloquinoline Carbaldehydes in One-Pot Reaction

The homocoupling of 2‐chloro‐carbaldehyde derivatives gave the corresponding 2,2’‐biquinolines by using the in situ generated reactive reagent Ni[(PPh 3 )] 4 . Several new 2‐chloro‐3‐(1.3 dioxalan‐2yl) quinoline derivatives are synthesized and structurally characterized. The overall structures of biquinoline derivatives are not planar.