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Sigma-Aldrich

Tetramethyl orthosilicate

≥99%

Synonym(s):

Tetramethoxysilane

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About This Item

Linear Formula:
Si(OCH3)4
CAS Number:
681-84-5
Molecular Weight:
152.22
Beilstein:
1699658
EC Number:
211-656-4
MDL number:
MFCD00008341
UNSPSC Code:
12352300
PubChem Substance ID:
24860943
NACRES:
NA.23

vapor density

5.25 (vs air)

Quality Level

200

vapor pressure

13 hPa ( 20 °C)

Assay

≥99%

form

liquid

refractive index

n20/D 1.368 (lit.)

bp

121-122 °C (lit.)

mp

−4 °C (lit.)

density

1.023 g/mL at 25 °C (lit.)

SMILES string

CO[Si](OC)(OC)OC

InChI

1S/C4H12O4Si/c1-5-9(6-2,7-3)8-4/h1-4H3

InChI key

LFQCEHFDDXELDD-UHFFFAOYSA-N

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General description

Tetramethyl orthosilicate is a colorless organosilicon compound consisting of four methoxy groups bonded to a silicon atom. On hydrolysis, it produces silicon dioxide and methanol. It has been widely used in catalysis, synthesis of nanomaterials, ceramics, zeolites, and coating materials.

Application

Tetramethyl orthosilicate can be used:
  • As a precursor to synthesize organic-inorganic coating materials by sol-gel processing method.
  • As an efficient reagent for direct amidation of aliphatic and aromatic carboxylic acids with amines and anilines.
  • As a precursor to fabricate SiO2 nanocomposite films by chemical vapor deposition(CVD) method.
  • As a selective catalyst ofC3-methylation of indole.
Used in the sol-gel synthesis of chromium-doped silicates and in the formation of hexagonal mesoporous silica layers.

Signal Word

Danger

Hazard Statements

H226 - H315 - H318 - H330

Hazard Classifications

Acute Tox. 1 Inhalation - Eye Dam. 1 - Flam. Liq. 3 - Skin Irrit. 2

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

78.8 °F - closed cup

Flash Point(C)

26 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Tetramethyl Orthosilicate (TMOS) as a Reagent for Direct Amidation of Carboxylic Acids
D. Christopher Braddock, et al.
Organic Letters, 20, 950-953 (2018)
Yun Tian et al.
Electrophoresis, 29(4), 960-970 (2008-01-24)
A novel calix[4] open-chain crown ether (p-tert-butylcalix[4]arene-1,3-bis(allyloxyethy) ether)-modified, organic-inorganic hybrid silica-based monolithic column possessing vinyl ligands for CEC is described. The monolithic silica matrix containing a vinyl functionality was synthesized by in situ cocondensation of tetramethoxysilane (TMOS) and vinyltrimethoxysilane (VTMS)
Yonghao Xiu et al.
Journal of colloid and interface science, 326(2), 465-470 (2008-07-29)
A method for the preparation of inorganic superhydrophobic silica coatings using sol-gel processing with tetramethoxysilane and isobutyltrimethoxysilane as precursors is described. Incorporation of isobutyltrimethoxysilane into silica layers resulted in the existence of hydrophobic isobutyl surface groups, thereby generating surface hydrophobicity.
Josef Planeta et al.
Journal of chromatography. A, 1217(36), 5737-5740 (2010-08-03)
The temperature effects during the sol-gel process and ageing of the silica-based monolith on the structure and separation efficiency of the capillary columns (100microm i.d., 150mm) for HPLC separations were studied. The tested columns were synthesized from a mixture of
Yan Fang et al.
Journal of chromatography. A, 1217(41), 6405-6412 (2010-09-03)
A simple capillary flow porometer (CFP) was assembled for through-pore structure characterization of monolithic capillary liquid chromatography columns in their original chromatographic forms. Determination of differential pressures and flow rates through dry and wet short capillary segments provided necessary information
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