A third route to the formation and decomposition of siloxane structures. To siloxanes through silanones

On the basis of his own and literature data, the author considers and gives theoretical substantiation to the routes for the formation and decompositi on of linear and cyclic oligo- and polysiloxanes through an intramolecular reaction of geminal fragmentation of > Si(OR)X groups with the intermediate formation (alpha-elimination) of short-lived silanones R2Si = O. The latte r further undergoes polymerization or insertion into Si-X bonds (X = O, Cl: etc.) of trapping reagents.