| 摘要 |
1,214,485. Heterocyclic silicon compounds; chain-stopped polysiloxanes. GENERAL ELECTRIC CO. 6 Dec., 1967 [22 Dec., 1966], No. 55441/67. Headings C3S and C3T. The invention comprises heterocyclic silicon compounds of the general formula where R is a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation, R<SP>1</SP> is H or R and R<SP>11</SP> is an alkyleneoxyalkylene or alkylenethioalkylene radical. They can be prepared by contacting of a mixture of with a platinum catalyst. The compound of formula can also be prepared by the free radical addition of to The examples describe this preparation and the preparation of the compound These compounds are separately cohydrolysed with Me 2 SiCl 2 to give polydimethylsiloxanes terminated with respectively. |
