Scope of 1,3-diynes for the synthesis of conjugated enynes^a.

^aAll reactions were carried out using Pd(PPh₃)₄ (10 mol%), PCy₃ (0.2 equiv.), 1 (0.20 mmol, 2.0 equiv.), and 2a (0.10 mmol, 1.0 equiv.) in toluene (0.25 M) at 100 °C for 16 h.