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341436

Sigma-Aldrich

Tetramethyl orthosilicate

≥99%

Synonym(s):

Tetramethoxysilane

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$64.40
100 G
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Estimated to ship onApril 14, 2025FromMILWAUKEE

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25 G
$64.40
100 G
$146.00

About This Item

Linear Formula:
Si(OCH3)4
CAS Number:
681-84-5
Molecular Weight:
152.22
Beilstein/REAXYS Number:
1699658
EC Number:
211-656-4
MDL number:
MFCD00008341
UNSPSC Code:
12352103
PubChem Substance ID:
24860943
NACRES:
NA.23

$64.40

Estimated to ship onApril 14, 2025FromMILWAUKEE

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vapor density

5.25 (vs air)

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.[1][2]

Application

Tetramethyl orthosilicate can be used:
  • As a precursor to synthesize organic-inorganic coating materials by sol-gel processing method.[1]
  • As an efficient reagent for direct amidation of aliphatic and aromatic carboxylic acids with amines and anilines.[3]
  • As a precursor to fabricate SiO2 nanocomposite films by chemical vapor deposition(CVD) method.[2]
  • As a selective catalyst ofC3-methylation of indole.[4]
Used in the sol-gel synthesis of chromium-doped silicates and in the formation of hexagonal mesoporous silica layers.

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Danger

Hazard Classifications

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

Storage Class

3 - Flammable liquids

wgk_germany

WGK 1

flash_point_f

78.8 °F - closed cup

flash_point_c

26 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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Certificates of Analysis (COA)

Lot/Batch Number
BCCL2070
BCCH3075
BCCH2464
BCCH2086
BCCG3627

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Tetramethyl orthosilicate as a sharp-selective catalyst of C3-methylation of indole by supercritical methanol
I.V.Kozhevnikov, et al.
Journal of Supercritical Fluids, 69, 82-90 (2012)
Tetramethyl Orthosilicate (TMOS) as a Reagent for Direct Amidation of Carboxylic Acids
D. Christopher Braddock, et al.
Organic Letters, 20, 950-953 (2018)
Fabrication and characteristics of SiOx films by plasma chemical vapor deposition of tetramethylorthosilicate
Mu-Rong Yang, et al.
Surface and Coatings Technology, 123, 204-209 (2000)
Preparation of sol-gel hybrid materials from gamma-methacryloxypropyltrimethoxysilane and tetramethyl orthosilicate: study of the hydrolysis and condensation reactions
Amir A, et al.
Colloid and Polymer Science, 289, 1875-1883 (2011)
Carmen Carrasquilla et al.
Journal of the American Chemical Society, 134(26), 10998-11005 (2012-06-26)
Structure-switching, fluorescence-signaling DNA and RNA aptamers have been reported as highly versatile molecular recognition elements for biosensor development. While structure-switching DNA aptamers have been utilized for solid-phase sensing, equivalent RNA aptamers have yet to be successfully utilized in solid-phase sensors
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