Sodium silox

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title: "Sodium silox" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["organosilicon-compounds", "sodium-compounds"] topic_path: "general/organosilicon-compounds" source: "https://en.wikipedia.org/wiki/Sodium_silox" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

| ImageFile = NaSilox2.png | ImageSize = 220 | ImageName = Stereo structural formula of tetrameric sodium silox | IUPACName = Sodium silox | SystematicName = Sodium tri-tert-butylsilanolate |Section1={{Chembox Identifiers | CASNo = 461703-02-6 | CASNo_Ref = | ChemSpiderID = 35766904 | PubChem = 23701721 | SMILES = [Na+].CC(C)(C)Si(C(C)(C)C)C(C)(C)C | StdInChI = 1S/C12H27OSi.Na/c1-10(2,3)14(13,11(4,5)6)12(7,8)9;/h1-9H3;/q-1;+1 | StdInChIKey = QAGFKHQOLBYGIF-UHFFFAOYSA-N}} |Section2={{Chembox Properties | C=12 | H=27 | Na=1 | O=1 | Si=1 | Appearance = colourless solid}} |Section3={{Chembox Hazards | ExternalSDS = | FlashPt= | AutoignitionPt = | HPhrases = | PPhrases = | GHS_ref = Sodium silox is the name for an organosilicon compound that serves as a source of the siloxide anion [(CH3)3C]3SiO−. Complexes of this bulky anionic ligand often adopt with low coordination numbers. Examples include Ti(silox)3, Nb(silox)3(PMe3), and [Cr(silox)3]−.

Properties of silox and related complexes

The sodium derivative, which has salt-like properties, is a cubane-type cluster.

Related bulky anionic ligands include C5Me5−, (Me3Si)2N−, and NacNac−. Silox has a larger cone angle than C5Me5− and is a poorer donor. It is also larger than silylamides. For these reasons, silox anion forms highly unsaturated complexes.

Complexes with high coordinative unsaturation display high reactivity so long as they do not undergo intramolecular reactions. Silox offers this possibility. Examples of high reactivity exhibited by metal-silox compounds include the C-O bond in carbon monoxide and the C-N bond in pyridine.

Preparation

Na(silox) is usually prepared by deprotonation of the silanol (t-Bu)3SiOH, which is prepared by a multistep route via the intermediacy of (t-Bu)2SiF2. It is also obtained by treatment of tBu3SiNa with nitrous oxide.

Related compounds

References

References

  1. Lerner, Hans-Wolfram; Scholz, Stefan; Bolte, Michael "The Sodium Siloxides (tBu3SiONa)4 and (tBu2PhSiONa)4: Synthesis and X-ray Crystal Structure Analysis" Organometallics 2002, 21, 3827-3830. {{doi. 10.1021/om020318v
  2. Peter T. Wolczanski "Chemistry of electrophilic metal centres coordinated by silox (tBu3SiO), tritox (tBu3CO) and related bifunctional ligands" Polyhedron, 1995, 14, 3335-3362. {{doi. 10.1016/0277-5387(95)85014-7.
  3. Edward M. Dexheimer and Leornard Spialter, Lee D. Smithson "Tri-t-butylsilane: synthesis, physical properties, derivatives, and reactivity towards ozonolysis, chlorination, fluorination, and hydrolysis" Journal of Organometallic Chemistry 102, 1975, 21-27.{{doi. 10.1016/S0022-328X(00)90256-0.

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organosilicon-compoundssodium-compounds