A Third Route to the Formation and Decomposition of Siloxane Structures. To Siloxanes Through Silanones

Abstract

On the basis of his own and literature data, the author considers and gives theoretical substantiation to the routes for the formation and decomposition of linear and cyclic oligo- and polysiloxanes through an intramolecular reaction of geminal fragmentation of > Si(OR)X groups with the intermediate formation (α-elimination) of short-lived silanones R₂ Si = O. The latter further undergoes polymerization or insertion into Si–X bonds (X = O, Cl, etc.) of trapping reagents.