Synthesis of dimethylcyclosiloxanes containing silicon-attached functional groups

Summary

• 1. Double decomposition between the sodium derivative of 1,5-dihydroxyhexamethyltrisiloxane and trichloromethylsilane with excess of the latter, proceeds in the direction of the formation of cyclic products of low molecular weight.

• 2. The replacement of chlorine in chloroheptamethylcyclotetrasiloxane by the methoxy or phenoxy group proceeds in a complex manner, and in addition to methoxyor phenoxy-heptamethylcyclotetrasiloxane, polymeric products are also formed.

• 3. The replacement of chlorine in chloroheptamethylcyclotetrasiloxane by the amino or anilino group occurs readily with formation of aminoor anilino-heptamethylcyclotetrasiloxane.

• 4. Cohydrolysis reactions of dichlorodimethylsilane with dichloroethoxymethylsilane and with butoxydi-chloromethylsilane were investigated, and new cyclic compounds were synthesized, namely, diethoxyhexamethyl cyclotetrasiloxane and dibutoxyhexamethyl-cyclotetrasiloxane.