Dichlorodiphenylsilane → Octaphenylcyclotetrasiloxane

Participants

Reaction Steps

A mixture of 510 g of diphenyldichlorosilane in 500 ml of acetone was added dropwise in the course of 3 hours to a hot solution, at 60° C, of 340 g of KOH in 1 l of water, while stirring vigorously. The acetone and a little water were then distilled off and, after cooling the residue, the crystalline octaphenylcyclotetrasiloxane was filtered off and washed with water. After drying, 376 g (94% yield) of octaphenylcyclotetrasiloxane of melting point 187° C (metastable crystal modification) were obtained. After recrystallization from toluene, the product had a melting point of 201° C.

Provenance & Evidence