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334901

Tetramethylammonium hydroxide solution

25 wt. % in methanol, solution

Synonym(s):

N,N,N-trimethyl-methanaminium hydroxide, TMAH, TMAOH

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About This Item

Linear Formula:
(CH3)4N(OH)
CAS Number:
75-59-2
Molecular Weight:
91.15
NACRES:
NA.21
PubChem Substance ID:
57648847
UNSPSC Code:
12352100
MDL number:
MFCD00008280
Beilstein/REAXYS Number:
3558708
Concentration:
25 wt. % in methanol
Form:
liquid
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Product Name

Tetramethylammonium hydroxide solution, 25 wt. % in methanol

vapor pressure

17.5 mmHg ( 20 °C)

Quality Segment

form

liquid

reaction suitability

core: ammonium, reaction type: phase-transfer

concentration

25 wt. % in methanol

impurities

≤10% water, ≤2% chloride

density

0.866 g/mL at 25 °C

functional group

amine

SMILES string

[OH-].C[N+](C)(C)C

InChI

1S/C4H12N.H2O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1

InChI key

WGTYBPLFGIVFAS-UHFFFAOYSA-M

General description

Tetramethylammonium hydroxide is a strong base used in the o-alkylation of phenolic and carboxylic OH groups.

Tetramethylammonium hydroxide is a quaternary ammonium salt generally used as an anisotropic etchant for silicon due to its high silicon etching rate.

Application

Tetramethylammonium hydroxide solution (25 wt.% solution in methanol) may be used in the synthesis of zirconium oxides via a modified sol-gel method with potential application as catalyst materials in CO hydrogenation.

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Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Acute Tox. 3 Inhalation - Aquatic Chronic 3 - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B - STOT RE 1 Dermal - STOT SE 1

Target Organs

Eyes,Central nervous system, Liver,thymus

Storage Class

3 - Flammable liquids

WGK

WGK 3

Flash Point (°F)

80.6 °F - closed cup

Flash Point (°C)

27 °C - closed cup

PPE (personal protective equipment)

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

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