CO[CH:3](OC)[CH:4]([CH3:13])[CH2:5][Si:6]([O:11][CH3:12])([O:9][CH3:10])[O:7][CH3:8].COC(OC)C(=C)C.CO[SiH](OC)OC.[CH2:31]([SH:34])[CH2:32][SH:33]>[Cl-].[Zn+2].[Cl-]>[CH3:13][CH:4]([CH:3]1[S:34][CH2:31][CH2:32][S:33]1)[CH2:5][Si:6]([O:11][CH3:12])([O:9][CH3:10])[O:7][CH3:8]The procedure and apparatus of Example 1 were used with 25.0 g (0.102 m) of (3,3-dimethoxy-2-methylpropyl)trimethoxysilane (boiling point, 125°/25 mm, prepared by the hydrosilation of methacrolein dimethyl acetal with trimethoxysilane, as characterized by GC/MS and NMR), 9.6 g (0.102 m) of ethane-1,2-dithiol, and 0.07 g of anhydrous zinc chloride catalyst. The crude product, after distillation to a pot temperature of 195°, was 27.1 g, containing 64.3% of the title product as determined by GC/MS.
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