F[C:2](F)(F)C(O)=O.C([Zn]CC)C.ICI.[I:16][C:17](=[CH2:37])[CH2:18][C@@H:19]([CH2:28][O:29][Si:30]([CH3:36])([CH3:35])[C:31]([CH3:34])([CH3:33])[CH3:32])[O:20][Si:21]([CH3:27])([CH3:26])[C:22]([CH3:25])([CH3:24])[CH3:23]>ClCCCl>[I:16][C:17]1([CH2:18][C@@H:19]([CH2:28][O:29][Si:30]([CH3:36])([CH3:35])[C:31]([CH3:34])([CH3:33])[CH3:32])[O:20][Si:21]([CH3:27])([CH3:26])[C:22]([CH3:25])([CH3:24])[CH3:23])[CH2:2][CH2:37]1Trifluoroacetic acid (8 eq) is added to a solution of diethyl zinc (16 eq) in DCE at 0° C. and stirred for 35 mins. Diiodomethane (8 eq) is added at 0° C., and the mixture stirred for an additional 20 min. A solution of (S)-5-(2-iodoallyl)-2,2,3,3,8,8,9,9-octamethyl-4,7-dioxa-3,8-disiladecane (1 eq) in DCE is added and the reaction stirred at room temperature overnight. The reaction is quenched by addition of a mixture of methanol and brine. After stirring for an additional hour, the mixture is concentrated under reduced pressure. The crude material is extracted with aqueous NH4Cl/CHCl3 and the organic layer washed with brine, dried (MgSO4) and concentrated under reduced pressure. The crude material is triturated in hexane and the solution filtered and evaporated to afford (S)-5-((1-iodocyclopropyl)methyl)-2,2,3,3,8,8,9,9-octamethyl-4,7-dioxa-3,8-disiladecane.
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