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2052-49-5

Basic Information
CAS No.: 2052-49-5
Name: Tetrabutylammonium hydroxide
Article Data: 25
Cas Database
Molecular Structure:
Molecular Structure of 2052-49-5 (Tetrabutylammonium hydroxide)
Formula: C16H36N.OH
Molecular Weight: 259.476
Synonyms: 1-Butanaminium,N,N,N-tributyl-, hydroxide (9CI);Ammonium, tetrabutyl-, hydroxide (8CI);Tetrabutylammonium hydroxide (6CI);Tetrabutylammonium hydroxide solution;
EINECS: 218-147-6
Density: 0.995 g/cm3
Melting Point: 27-30 °C(lit.)
Boiling Point: 100 °C
Flash Point: 7 °C
Solubility: Soluble in water, methanol.
Appearance: Aqueous solution
Hazard Symbols: ToxicT, FlammableF, CorrosiveC
Risk Codes: 34-36/38-23/24/25-11-67-39/23/24/25-36-65-63-38
Safety: 7-16-26-36/37/39-45-36/37-62-27
Transport Information: UN 3267 8/PG 2
PSA: 23.06000
LogP: 4.82680
Synthetic route
1643-19-2

tetrabutylammomium bromide

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
With potassium hydroxide In dichloromethane at 20℃; for 10h;82%
With silver(l) oxide In water for 20h;
Multi-step reaction with 2 steps
1: potassium iodide / H2O
2: silver hydroxyde / H2O
View Scheme
1033762-44-5

7-[(2E)-2-(2,3-dihydro-1H-inden-1-ylidene)ethyl]-8-([dimethyl(1,1,2-trimethylpropyl)silyl]oxy)-n,n,2,3-tetramethylimidazo[1,2-a]pyridine-6-carboxamide

429-41-4

tetrabutyl ammonium fluoride

A

1033762-35-4

7-[(2E)-2-(2,3-dihydro-1H-inden-1-ylidene)ethyl]-8-hydroxy-n,n,2,3-tetramethylimidazo[1,2-a]pyridine-6-carboxamide

B

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
In tetrahydrofuran at 20℃; for 1h;A 71%
B n/a
311-28-4

tetra-(n-butyl)ammonium iodide

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
In water for 4h; electrolysis in a divided cell with Nafion membrane, -1.0 V;
With AgOH In water
With (Cy3P)2Pd(Ph)(OH); water In tetrahydrofuran at 20℃; Equilibrium constant; Inert atmosphere; Sealed vial;
With water; silver(l) oxide at 20℃;

C34H51NOSi

A

2052-49-5

tetra(n-butyl)ammonium hydroxide

B

791-31-1

triphenylhydroxysilane

Conditions
ConditionsYield
In acetonitrile at 25℃; Equilibrium constant;

tetra-n-butylammonium bis(ortho-hydroxymethylphenolato)borate

A

90-01-7

salicylic alcohol

B

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
With water; boric acid In dimethylsulfoxide-d6 at 30℃; Equilibrium constant;

tetrabutyl-ammonium; benzo[1,3,2]dioxaborol-2-olate

A

2052-49-5

tetra(n-butyl)ammonium hydroxide

B

120-80-9

benzene-1,2-diol

Conditions
ConditionsYield
With water; boric acid In dimethylsulfoxide-d6 at 30℃; Equilibrium constant;

tetrabutyl-ammonium; 4H-benzo[1,3,2]dioxaborinin-2-olate

A

90-01-7

salicylic alcohol

B

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
With water; boric acid In dimethylsulfoxide-d6 at 30℃; Equilibrium constant;

tetra-n-butylammonium bis[catecholato(2-)-O,O']borate

A

2052-49-5

tetra(n-butyl)ammonium hydroxide

B

120-80-9

benzene-1,2-diol

Conditions
ConditionsYield
With water; boric acid In dimethylsulfoxide-d6 at 30℃; Equilibrium constant;
1112-67-0

tetrabutyl-ammonium chloride

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
With (Cy3P)2Pd(Ph)(OH); water In tetrahydrofuran at 20℃; Equilibrium constant; Inert atmosphere; Sealed vial;
With potassium hydroxide In ethanol at 40℃; for 12h; Inert atmosphere;
With potassium hydroxide In ethanol at 20℃; for 12h; Inert atmosphere;
With sodium hydroxide In dichloromethane
102-82-9

tributyl-amine

2052-49-5

tetra(n-butyl)ammonium hydroxide

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: acetonitrile / 33 h / 82 °C
2: potassium hydroxide / acetonitrile; ethanol / 50 h / 4 °C
View Scheme
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Chemistry

IUPAC Name: Tetrabutylazanium hydroxide
Synonyms of Tetrabutylammonium hydroxide (CAS NO.2052-49-5): N,N,N-Tributyl-1-butanaminium hydroxide ; Tetra-n-butylammonium hydroxide ; Tetrabutylammonium hydroxide ;1-Butanaminium, N,N,N-tributyl-, hydroxide ;1-Butanaminium, N,N,N-tributyl-, hydroxide (1:1) ; Ammonium, tetrabutyl-, hydroxide
CAS NO: 2052-49-5
Molecular Formula: C16H36N.OH
Molecular Weight: 259.47
Molecular Structure:
H bond acceptors: 1
H bond donors: 0
Freely Rotating Bonds: 12
Polar Surface Area: 0 Å2
EINECS: 218-147-6
Melting point : 27-30 °C(lit.)
Boiling point : 100 °C 
Density: 0.995 
Refractive index: 1.4 
Flash Point: 7°C
Storage temp: 2-8°C
Appearance: Aqueous solution
Sensitive: Air Sensitive/Hygroscopic
Product Categories: quarternary ammonium bases;Ammonium Hydroxides (Quaternary);Analytical Chemistry;HPLC Ion-Pair Reagents for Acidic Samples;Ion-Pair Reagents for HPLC;Quaternary Ammonium Compounds;Organic BasesEssential Chemicals;Reagent GradeVolumetric Solutions;Base Solutions;Titration;Organic BasesVolumetric Solutions;ACS GradeChemical Synthesis;Essential Chemicals;Routine Reagents

Uses

 Tetrabutylammonium hydroxide (CAS NO.2052-49-5) is commonly used as a base in organic chemistry.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LDLo subcutaneous 19mg/kg (19mg/kg)   Journal of Pharmacology and Experimental Therapeutics. Vol. 28, Pg. 367, 1926.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Safety Information about Tetrabutylammonium hydroxide (CAS NO.2052-49-5):
Hazard Codes: CorrosiveC,ToxicT,FlammableF
Risk Statements: 34-36/38-11-67-39/23/24/25-65-63
R34: Causes burns. 
R36/38: Irritating to eyes and skin. 
R11: Highly flammable. 
R67: Vapours may cause drowsiness and dizziness. 
R63: Possible risk of harm to the unborn child. 
R65: Harmful: may cause lung damage if swallowed.
R39/23/24/25: Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed
Safety Statements: 7-16-26-36/37/39-45-62-27 
S7: Keep container tightly closed. 
S16: Keep away from sources of ignition. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S27: Take off immediately all contaminated clothing. 
S45: In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S62: If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection.
RIDADR: UN 3267 8/PG 2
WGK Germany: 1
RTECS: BS5425000
F: 9-34
Hazard: Note Highly Flammable/Toxic/Corrosive/Air Sensitive/Hygroscopic
HazardClass: 3
PackingGroup: II

Specification

General Information: As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear.
Extinguishing Media: Use foam, dry chemical, or carbon dioxide. 
Handling: Avoid contact with eyes, skin, and clothing. Do not breathe dust, vapor, mist, or gas. Use only in a chemical fume hood.
Storage: Store in a cool, dry place. Store in a tightly closed container. Corrosives area.