Potassium tert-butoxide

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Potassium tert-butoxide

Strong organic alkaline chemical properties reaction Uses preparation Precautions

Product Name: Potassium tert-butoxide
CAS No.: 865-47-4
Chemical Name: Potassium tert-butoxide
Synonyms: t-BuOK;POTASSIUM TERT-BUTYLATE;POTASSIUM T-BUTOXIDE;KTB;Potassium Tertiary Butoxide;tert-BuOK;Potassium tert-butanolate;tert-Butoxypotassium;tert-butoxide, potassium;PotassiuM tert-butyl alcohol
CBNumber: CB1335932
Molecular Formula: C4H9KO
Formula Weight: 112.21
MOL File: 865-47-4.mol

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Potassium tert-butoxide Property

Melting point:: 256-258 °C (dec.) (lit.)
Boiling point:: 275°C
Density: 0.910 g/mL at 20 °C
vapor pressure: 1 mm Hg ( 220 °C)
Flash point:: 54 °F
storage temp.: Store below +30°C.
solubility: Soluble in hexane, toluene, diethyl ether and terahydrofuran.
form: Solution
pka: pK1:18(25°C)
Specific Gravity: 0.902
color: White to off-white
PH: 13 (5g/l, H2O, 20℃)Hydrolysis
Water Solubility: REACTS
Sensitive: Moisture Sensitive
Hydrolytic Sensitivity: 7: reacts slowly with moisture/water
BRN: 3556712
Stability:: Stable, but reacts violently with water and acids, possibly leading to fire. Incompatible with water, acids, halogenated hydrocarbons, alcohols, strong oxidizing agents, ketones, carbon dioxide.
InChIKey: LPNYRYFBWFDTMA-UHFFFAOYSA-N
CAS DataBase Reference: 865-47-4(CAS DataBase Reference)
EPA Substance Registry System: 2-Methyl-2-propanol, potassium salt (865-47-4)

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Safety

Hazard Codes: F,C,Xi
Risk Statements: 11-19-22-34-35-14-20-36/37-37
Safety Statements: 16-26-36/37/39-43-45-7/9-8-43A-33-27-29
RIDADR: UN 3274 3/PG 2
WGK Germany: 1
F: 10-21
Autoignition Temperature: 483 °C
Hazard Note: Flammable solid/Corrosive
TSCA: Yes
HazardClass: 8
PackingGroup: I
HS Code: 29051900

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H228Flammable solid

H260In contact with water releases flammable gases which may ignite spontaneously

H314Causes severe skin burns and eye damage

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P231+P232Handle under inert gas. Protect from moisture.

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 8.43849
Product name: Potassium tert-butylate
Purity: (~ 20% solution in tetrahydrofuran) for synthesis
Packaging: 50mL
Price: $86.1
Updated: 2024/03/01

Sigma-Aldrich

Product number: 8.04918
Product name: Potassium tert-butylate
Purity: for synthesis
Packaging: 100g
Price: $67.1
Updated: 2024/03/01

Sigma-Aldrich

Product number: 8.43849
Product name: Potassium tert-butylate
Purity: (~ 20% solution in tetrahydrofuran) for synthesis
Packaging: 250ML
Price: $244
Updated: 2024/03/01

Sigma-Aldrich

Product number: 8.04918
Product name: Potassium tert-butylate
Purity: for synthesis
Packaging: 250g
Price: $134
Updated: 2024/03/01

Sigma-Aldrich

Product number: 8.04918
Product name: Potassium tert-butylate
Purity: for synthesis
Packaging: 2.5kg
Price: $324
Updated: 2024/03/01

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Potassium tert-butoxide Chemical Properties,Usage,Production

Strong organic alkaline

Potassium tert-butoxide is an important kind of organic base with its alkalinity being stronger than potassium hydroxide. Because of the induction effect of three methyl groups in the (CH3) 3CO-, it has stronger alkalinity and activity than other potassium alkoxides, thus being a very excellent catalyst. In addition, as a kind of strong alkaline, potassium tert-butoxide is widely used in the organic synthesis of chemical, pharmaceutical, and pesticide such as trans-esterification, condensation, rearrangement, polymerization, loop opening and the production of heavy metal orthoester. It can be used to catalyze the Michael addition reaction, Pinacol rearrangement reaction and Ramberg-Backlund rearrangement reaction. Potassium tert-butoxide is used as a condensing agent, which can be used to catalyze Darzens condensation reaction and Stobbe condensation reaction. It is also the most effective alkaline for traditional akloxide-haloform reaction generating dihalogenated carbene. Therefore, potassium tert-butoxide has attracted more and more attention from chemical, pharmaceutical, pesticide and other industries. As potassium tert-butoxide has such a wide application, the domestic and international demand for high purity potassium tert-butoxide is very large. However, due to its production cost is higher than other alkali metal alkoxides, the production technology needs to be improved, so in-depth study of potassium tert-butoxide is particularly important.

chemical properties

Potassium tert-butoxide is a strong alkaline condensing agent with its alkalinity is stronger than sodium methoxide and sodium ethoxide. At room temperature, this product is white or white-like solid powder with its chemical formula being (CH3) 3C-O-K, molecular weight being 112.21, density being 0.929, the melting point of 256-258°C and the boiling point being 275°C. It is easy to absorb moisture. It is soluble in tert-butanol with the solution being relative stable, and commonly used in the dehydrohalogenation reaction of halogenated hydrocarbon. Being exposure to air decomposition, it can be decomposed into potassium oxide and tert-butyl alcohol when coming across water. It can be manufactured through the reaction between butanol and potassium, followed by the vacuum distillation of tert-butanol in the system.
Potassium tert-butoxide is used as a strong non-nucleophilic base in organic chemistry. It is widely used the condensation reaction, rearrangement and ring-opening reaction in organic synthesis. People generally apply tert-butanol solution. Potassium tert-butoxide is a kind of organic alkaline corrosion products with strong moisture absorption property and should be sealed for storage. We need to pay attention to prevention of fire and sunshine during the storage and transportation. It should be stored in a cool, ventilated and dry place.

reaction

Potassium tert-butoxide may be used as a base in the intramolecular cyclization of iodo arene to afford benzopyran via microwave method of synthesis.
Potassium tert-butoxide has been used as a strong base in the enantioselective synthesis of amines by transfer hydrogenation of N-(tertbutylsulfinyl)imines.
Take 2, 6, 6-trimethylcyclohexane-2-alkenyl formaldehyde to have reaction with allyl Grignard agent to generate cyclohexenyl butenol, followed by the oxidation under copper-zinc catalyst to generate cyclohexane alkenyl ketene, followed by isomerization in the alkali solution of potassium tert-butoxide, being able to generate Damascenone.

Darzen reaction: aldehydes and ketones, in the presence of alkaline reagents, can have ester-aldol condensation reaction with α-halo acid ester, while having the hydrogen halogen lost, generating α, β-epoxy ester. Common alkaline reagents include sodium ethoxide, sodium amide, sodium metal, potassium tert-butoxide and so on.
Stobbe reaction: aldehydes, ketones and succinate ester, in the presence of alkaline catalysts (such as sodium ethoxide, potassium tert-butoxide, sodium chloride, etc.) have reaction similar to the aldol condensation reaction, generating succinate or its monoester with the methylene replaced by hydrocarbon.
KOtBu: A Privileged Reagent for Electron Transfer Reactions
Potassium tert-butoxide mediated C–C, C–N, C–O and C–S bond forming reactions

Uses

Potassium tert-butoxide, as a strong alkaline, is widely used in the condensation, rearrangement and ring opening reaction in organic production in the fields of chemical, pharmaceutical and pesticide.
It can also be used:
To synthesize aliphatic and aromatic amides from corresponding esters and amines.
As a base in the intramolecular cyclization of aryl ethers, amines, and amides.
As a catalyst to prepare styrene derivatives from aryl halides and alkenes by Mizoroki-Heck reaction.

preparation

The potassium metal was added to the freshly distilled tert-butanol under nitrogen atmosphere, refluxed to until the potassium was completely melted. Further incubate for 1 hour. The excess amount of t-butyl alcohol was distilled off with the remaining white solid subjecting to vacuum drying under reduced pressure at 180-190 °C for 10 h. Then we can obtain the crystal powder of potassium tert-butanol. It needs to saved be under the nitrogen atmosphere for using. It should be kept away from air & water, or will become pink. The yield, calculated according to potassium, is more than 99%. The chemical reaction equation for the reaction between tert-butyl alcohol and metal potassium for preparation of potassium tert-butoxide is as follows:

Precautions

Potassium tert-butoxide has two types, liquid and solid. Usually the liquid industrial product is the tert-butanol solution of tert-butanol potassium with the color of the product being light yellow or milky white, being slightly turbid, in which the content of potassium tert-butoxide being 10% to 12%; the solid product is generally white or white powder in which the potassium tert-butoxide content is 95% to 97%.
Potassium tert-butoxide is organic alkaline corrosion product with strong moisture absorption property. It should be generally sealed for storage, generally stored in a cool, dry, ventilated warehouse. It should be kept away from heat and isolated from fire isolation as well as being protected from sun exposure. Potassium tert-butoxide has a strong corrosive effect on the skin. During the handling and loading process, the operator should wear a protective mask to prevent corrosion and burning by potassium tert-butoxide.
The above information is edited by Tongtong from Chemicalbook.

Chemical Properties

white crystalline powder

Uses

Usually used for greener amidation of esters.

Uses

Potassium tert-Butoxide is used in the synthesis of many organic compounds primarily as a strong base. In particular, it is used as a reagent in the base- catalyzed carbonylation of amines for the synthesis of N-Formamides.

General Description

This product has been enhanced for catalytic efficiency.

Fire Hazard

Potassium tert-butoxide is a flammable solid. It ignites on heating. Being very strongly basic, its reactions with acids are highly exothermic. Contact of solid powder with drops of sulfuric acid and vapors of acetic acid caused ignition after an induction period of 0.5 and 3 minutes, respectively (Manwaring 1973). Ignition occurs upon reactions with many common solvents of the type ketone, lower alcohols, esters, and halogenated hydrocarbons. Such solvents include acetone, methyl ethyl ketone, methyl isobutyl ketone, methanol, ethanol, n-propanol, isopropanol, ethyl acetate, n-propyl formate, n-butyl acetate, chloroform, methylene chloride, carbon tetrachloride, epichlorohydrin, dimethyl carbonate, and diethyl sulfate (NFPA 1997). Such ignition may arise from accidental contact of the alkoxide with these solvents and may be attributed to sudden release of energy from exothermic reactions. However, slow mixing of the powder with excess solvent will dissipate the heat. It reacts violently with water, producing tert-butanol and potassium hydroxide, as follows:
K―OC―(C4H9)3＋H2O → tert-C4H9OH +KOH
The addition of potassium tert-butoxide to the solvent dimethyl sulfoxide can cause ignition of the latter (Bretherick 1995).

Flammability and Explosibility

Flammable

Purification Methods

It sublimes at 220o/1mm. The last traces of tert-BuOH are removed by heating at 150-160o/2mm for 1hour. It is best prepared afresh as likely impurities are tert-BuOH, KOH and K2CO3 depending on its exposure to air. Its solubility at 25-26o in hexane, toluene, Et2O, and THF is 0.27%, 2.27%, 4.34% and 25.0%, respectively. [Feuer et.al. J Am Chem Soc 78 4364, Doering & Urban J Am Chem Soc 78 5938 1956, Beilstein 1 IV 1612.]

Potassium tert-butoxide Preparation Products And Raw materials

Raw materials

tert-Butanol

Preparation Products

2,4-DICHLORO-5-NITROPYRIDINE 3,5-DIMETHYL-1-HEXYN-3-OL ETHYL 5-NITROBENZOFURAN-2-CARBOXYLATE ISOXAZOLO[5,4-B]PYRIDIN-3-YLAMINE 1-CHLORO-4-ISOCYANOBENZENE 5-CHLOROBENZOFURAN-2-CARBOXYLIC ACID 2-[2-(DIPHENYLPHOSPHINO)ETHYL]PYRIDINE 1-(3-(4-AMINO-2,6-DICHLOROPHENOXY)PROPYL)PYRROLIDIN-2-ONE Ethyl 2-oxocyclopentanecarboxylate 5-Methoxybenzofuran-2-carboxylic acid 1-Ethynyl-1-cyclohexanol 5-NITRO-2-HYDROXY-4-METHOXYPYRIDINE 4-NITRO-PYRIDIN-3-YLAMINE 2-(DIPHENYLPHOSPHINO)ETHYLTRIETHOXYSILANE Epoprostenol 5-(2-ETHOXYPHENYL)-1-METHYL-3-N-PROPYL-1,6-DIHYDRO-7H-PYRAZOLO[4,3-D]-7-PYRIMIDINONE 5-NITROBENZOFURAN-2-CARBOXYLIC ACID 5-CHLORO-BENZOFURAN-2-CARBOXYLIC ACID ETHYL ESTER 5-N-PROPYLURACIL Stavudine Tacalcitol ETHYL 7-METHOXYBENZOFURAN-2-CARBOXYLATE 4-PYRIDIN-2-YLISOXAZOL-5-AMINE 4-Morpholinophenylboronic acid 5-METHOXYBENZOFURAN-2-CARBOXYLIC ACID, ETHYL ESTER 9-Ethyl-3-nitrocarbazole Rimonabant hydrochloride 4-CHLORO-8-FLUORO-5H-PYRIMIDO[5,4-B]INDOLE 1-ethynyl-4-tert-butyl-cyclohexan-1-ol Sertraline hydrochloride 2-(ETHYLTHIO)NICOTINIC ACID 3-Amino-1,2-benzisoxazole Antioxidant 1010 6-Chlorooxindole quinuclidine-3-carboxylic acid PYRIDINE-2,3,6-TRIAMINE 1R-cis crysanthemic acid 4-CYANO-4-(4-FLUOROPHENYL)CYCLOHEXANONE Letrozole 1-(3-Hydrazinylpropyl)pyrrolidin-2-one

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View Lastest Price from Potassium tert-butoxide manufacturers

Hunan aslsen technology co.,ltd

Product: Potassium Tert-Butoxide 865-47-4
Price: US $0.00-0.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 20tons
Release date: 2024-04-02

Hebei Saisier Technology Co., LTD

Product: Potassium tert-butoxide 865-47-4
Price: US $6.00/KG
Min. Order: 1KG
Purity: More than 99%
Supply Ability: 2000KG/MONTH
Release date: 2024-04-18

Hebei Duling International Trade Co. LTD

Product: Potassium tert-Butoxide 865-47-4
Price: US $100.00/kg
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Purity: 0.99
Supply Ability: 100 tons
Release date: 2022-09-23

865-47-4, Potassium tert-butoxideRelated Search:

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BuOk(PotassiuM tert-butoxide)

PotassiuM tert-butoxide reagent grade, >=98%

PotassiuM tert-butoxide solution 1.0 M in THF

PotassiuM tert-butoxide subliMed grade, 99.99% trace Metals basis

PotassiuM tert-butoxide, 1.0 M solution in tert-Butanol , SpcSeal

PotassiuM tert-butoxide, 1.0 M solution in THF, SpcSeal

PotassiuM tert-butoxide, 1.8 M solution in THF, SpcSeal

PotassiuM tert-butyl alcohol

Potassium-2-methylpropan-2-olate solution

Potassium tert-butylate 1M in THF

POTASSIUM T-BUTOXIDE

Potassium tert-butanolate

potassiumt-butoxide,ktb,int-butanol

potassiumt-butoxide,ktb,intetrahydrofuran

Tert-butylalcohol,potassiumderivative

KTB

Potassium Tertiary Butoxide

Potassium tert-butoxide, in isobutanol

Potassium tert-butoxide, in isopropanol

Potassium tert-butoxide, in t-butanol

Potassium tert-butoxide, in tetrahydrofuran

Potassium #ntert.-butylate

POTASSIUM TERT-BUTOXIDE SOLUTION, ~1 M I N THF

POTASSIUM TERT-BUTOXIDE, SUBLIMED, 99.9%

POTASSIUM TERT-BUTOXIDE, 1.0M SOLUTION I N 2-METHYL-2-PROPANOL

POTASSIUM TERT-BUTOXIDE SOLUTION, ~1 M I N TERT-BUTANOL

POTASSIUM TERT-BUTOXIDE, 1.0M SOLUTION I N TETRAHYDROFURAN

Potassium-Tert-Butoxide98%

Ktb(Potassium-Tert-Butoxide)

Potassiumtert-butoxide,95-99%

Potassium tert-butoxide,pure,1.7M (20 wt.%) solution in THF

Potassium tert-butoxide,98+%,pure

Potassium tert-butoxide,1M solution in tert-butanol

Potassium tert-butoxide ,99%

Potassium tert-butoxide [25% solution in THF]

Potassium tert-butoxide [1M solution in THF]

Potassium tert-butoxide, 1M solution in THF, AcroSeal§3, pure

Potassium tert-butoxide, 1M solution in tert-butanol, AcroSeal§3

Potassium t-butoxide, min. 98%

Potassium tert-butan

Potassium tert-butoxide, 1M solution in THF, AcroSeal, pure

Potassium tert-butoxide, 1.7M (20 wt.%) solution in THF, AcroSeal, pure

Potassium tert-butoxide, 1M solution in tert-butanol, AcroSeal

PotassiuM tert-butoxide, pure, 1M solution in THF, AcroSeal

PotassiuM tert-butoxide, 1M solution in THF, AcroSeal, pure 100ML

PotassiuM tert-butoxide, pure, 98+% 100GR

PotassiuM tert-butoxide, pure, 98+% 25GR

PotassiuM tert-butoxide, pure, 98+% 500GR

PotassiuM tert-butoxide, pure, 98+% 5GR

PotassiuM t-buroxide

Potassium tert-butoxide, 1.0M

Potassium tert-butoxide, 1.0M in THF

Potassium Tert-butanolate (KOtBu)

Potassium tert-butoxide Manufacturer

POTASSIUM t-BUTOXIDE, 20%, in TETRAHYDROFURANPOTASSIUM t-BUTOXIDE, 20%, in TETRAHYDROFURANPOTASSIUM t-BUTOXIDE, 20%, in TETRAHYDROFURANPOTASSIUM t-BUTOXIDE, 20%, in TETRAHYDROFURAN

POTASSIUM tert-BUTOXIDE, REAGENT, 95%POTASSIUM tert-BUTOXIDE, REAGENT, 95%POTASSIUM tert-BUTOXIDE, REAGENT, 95%POTASSIUM tert-BUTOXIDE, REAGENT, 95%

POTASSIUM t-BUTOXIDE, 1M in tetrahydrofuran (12-14 wt%)

POTASSIUM t-BUTOXIDE, 1.6M in tetrahydrofuran (19-20 wt%)