1: [((3,5-Me2C6H4[i-Pr]N)3Mo)2(HCCCH(p-MeOC6H4)OCH2CCH)]2+[I2]2- With lithium hexamethyldisilazane in tetrahydrofuran 0.75 h; 2: 2-hydroxybiphenyl in toluene 1 h; 3: diphenyl acetylene With hydrogenchloride more than 3 stages;