C([Si](C)(C)O[Si](C)(C)C=C)=C.[CH3:12][SiH:13]([CH3:15])[Cl:14].[C:16]1([O:22][CH2:23][CH2:24][O:25][CH2:26][CH:27]=[CH2:28])[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1>[Pt]>[O:22]([CH2:23][CH2:24][O:25][CH2:26][CH2:27][CH2:28][Si:13]([CH3:15])([CH3:12])[Cl:14])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=16 mg of platinum in the form of a solution of the complex with 1,3-divinyltetramethyldisiloxane are added to 290 ml (2.6 mol) of dimethylchlorosilane and the mixture is heated at reflux under a nitrogen atmosphere. 356 g of the 2-allyloxyethyl phenyl ether whose preparation is described above under a) are added dropwise over the course of about 2 hours, the temperature of the mixture being adjusted to 80° C. After 2 hours the reflux comes virtually to an end. The crude product is fractionated in vacuo, the main fraction being taken off at 95°-110° C. (2 hPa). 437 g of 3-(2-phenoxyethoxy)propyldimethylchlorosilane are obtained with an acid number of 207 (theoretically 205). The 1H NMR spectrum shows that the product contains neither starting material nor its 1-propeneoxy isomer.
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