Siloxide

Siloxides are chemical compounds with the formula R 3 SiOM, where R is usually an organic group and M is usually a metal cation. Also called silanolates, they are derived by deprotonation of silanols. They also arise by the degradation of siloxanes by base: :R 3 SiOSiR 3 + 2 NaOH → 2 R 3 SiONa + H 2 O Cleavage of cyclic siloxanes affords siloxides: :(Me 2 SiO) 3 + MeLi → Me 3 SiOSiMe 2 OSiMe 2 OLi These anions function as ligands for metal ions, forming complexes similar to metal alkoxides. Sodium trimethylsiloxide is useful for generating metal complexes by salt metathesis reactions. A very bulky siloxide is tert-butyl 3 SiO − , sometimes called silox. Siloxides are weaker net donors than alkoxides because p π -d donation has to compete with backbonding from the oxygen atom into the low-lying Si-C σ * orbitals.

Siloxides are chemical compounds with the formula R 3 SiOM, where R is usually an organic group and M is usually a metal cation. Also called silanolates, they are derived by deprotonation of silanols. They also arise by the degradation of siloxanes by base: R 3 SiOSiR 3 + 2 NaOH → 2 R 3 SiONa + H 2 O Cleavage of cyclic siloxanes affords siloxides: (Me 2 SiO) 3 + MeLi → Me 3 SiOSiMe 2 OSiMe 2 OLi These anions function as ligands for metal ions, forming complexes similar to metal alkoxides. Sodium trimethylsiloxide is useful for generating metal complexes by salt metathesis reactions. A very bulky siloxide is tert-butyl 3 SiO − , sometimes called silox. Siloxides are weaker net donors than alkoxides because p π -d donation has to compete with backbonding from the oxygen atom into the low-lying Si-C σ * orbitals. ==References==

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