There are disclosed a process for producing a coupling compound of formula (1):

(Y—)_(n-1)R¹—R²—(R¹)_(n-1),  (1)

• wherein R¹ and R² independently represent
  • a substituted or unsubstituted aryl group,
• which process is characterized by reacting
  • an unsaturated organic compound of formula (2):

    n(R¹X¹_n)  (2)

• wherein n, n, and R¹ are the same as defined above, and
• X¹ is the same or different and independently represents a leaving group and bonded with a sp2 carbon atom of R¹ group,
• with a boron compound of formula (3):

  m{R²(BX²₂)_n}  (3)

• wherein R² and n are the same as defined above,
• X² represents a hydroxy group, an alkoxy group, in the presence of a catalyst containing
  • (A) a nickel compound, and
  • (B) a nitrogen-containing cyclic compound, and the catalyst.