The reaction of methyldichlorosilane with cis-l, 3-, trans-1, 3-, and 1, 4-pentadienes in the presence of chloroplatinic acid has been investigated. All products were converted into the trimethylsilyl derivatives for glpc analysis and identification purposes. In the reaction involving 1, 4-pentadiene, three products were found in a 75.573 yield with the following composition after methylation: I-trimethylsilyl-4-pentene (87.2%); cis-l-trimethylsilyl-2- ...