[C:1]([Si:5]([CH3:19])([CH3:18])[O:6][CH:7]([C:11]1([CH2:15][CH2:16][CH3:17])[CH2:14][CH2:13][CH2:12]1)[CH2:8][C:9]#[CH:10])([CH3:4])([CH3:3])[CH3:2].[I:20]N1C(=O)CCC1=O>C(Cl)Cl.[H-].[Cl-].C1([Zr+2]C2C=CC=C2)C=CC=C1>[C:1]([Si:5]([O:6][CH:7]([C:11]1([CH2:15][CH2:16][CH3:17])[CH2:14][CH2:13][CH2:12]1)[CH2:8][CH:9]=[CH:10][I:20])([CH3:19])[CH3:18])([CH3:3])([CH3:4])[CH3:2]Bis(cyclopentadienyl)zirconiumchloride hydride (3.1 g, 12.0 mmol) was added to a solution of alkyne 5 (1.7 g, 3.94 mmol) in CH2Cl2 (20 mL) at 23° C. After 0.5 h N-iodosuccinimide (2.6 g, 12.0 mmol) was added. The reaction was stirred for 0.5 h, concentrated in vacuo and the residue was diluted with pentane and washed with saturated aqueous sodium bisulfite. The organic portion was dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by FCC (silica gel, 100% pentane) gave 1.2 g (71%) of the vinyl iodide 6 as a clear, light yellow oil.
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