| 摘要 |
PURPOSE:To obtain the subject polysiloxane having a definite and uniform siloxane chain length and useful as an intermediate for silicones by reacting dihydrogen organopolysiloxane with carbon tetrachloride in the presence of a metal chloride. CONSTITUTION:The objective polysiloxane of formula II is produced by reacting an alpha,omega-dihydrogen organopolysiloxane of formula I (R<1> and R<2> are H, alkyl, alkenyl, aryl or halogenoalkyl; (n) is 3-10) with preferably 100-500mol% (based on the compound of formula I) of carbon tetrachloride in the presence of preferably 0.01-10mol% (based on the compound of formula I) of a metal chloride (preferably palladium chloride) preferably at 10-40 deg.C. |
