抄録 A novel disubstituted alkyne synthesis was developed using molybdenum catalyzed cross-alkyne metathesis by Mortreux's catalyst [Mo (CO)< SUB> 6-< I> p-ClC< SUB> 6 H< SUB> 4 OH]. The reaction was carried out using Mo (CO)< SUB> 6(5 mol% for total amounts of alkynes) and< I> p-ClC< SUB> 6 H< SUB> 4 OH (1 equiv.) in the presence of an excess amount of another alkyne (3∼ 11 ...