[H+].[H+].Cl[Pt-2:4](Cl)(Cl)(Cl)(Cl)Cl.[C:10](=O)(O)[O-].[Na+].[CH:15]([Si:17]([CH3:25])([CH3:24])[O:18][Si:19]([CH3:23])([CH3:22])[CH:20]=[CH2:21])=C.[Pt]>C(O)(C)C>[Pt:4].[CH:22]([Si:19]([CH:20]=[CH2:21])([CH3:23])[O:18][Si:17]([CH3:25])([CH3:24])[CH3:15])=[CH2:10]3.0 kg chloroplatinic acid crystals (40% platinum content) and 15.0 kg isopropanol were placed in a 50-L reactor, and 6.0 kg sodium bicarbonate and 6.0 kg 1,3-divinyltetramethyldisiloxane were then added while stirring. The resulting suspension was heated while stirring. After reacting for 30 minutes at 65 to 75° C., the reaction mass was cooled and the solids were filtered off to give 22.0 kg of an isopropanol solution of platinum-divinyltetramethyldisiloxane complex catalyst. The platinum content was 4.1% as measured by x-ray fluorescence analysis, and the 1,3-divinyltetramethyldisiloxane content as measured by gas chromatography was 9.4%.
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