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865-47-4 - Potassium tert-butoxide, 97% - Potassium tert-butylate - A13947 - Alfa Aesar

A13947 Potassium tert-butoxide, 97%

Codice CAS
865-47-4
Sinonimi
Potassium tert-butylate

Dimensioni Prezzo ($) Quantità Disponibilità
25g 26,70
100g 40,60
250g 52,70
500g 95,90
1000g 170,00
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Potassium tert-butoxide, 97%

MDL
MFCD00012162
EINECS
212-740-3

Proprietà chimiche

Formula
C4H9KO
Peso formula
112.22
Punto di fusione
ca 255° dec.
Sensibilità
Air & Moisture Sensitive
Solubilità
Soluble in hexane, toluene, diethyl ether and terahydrofuran.

Applicazioni

Potassium tert-butoxide is used as a strong non-nucleophilic base in organic chemistry. It plays an active role in dehydrohalogenation reactions. It is also useful for greener amidation of esters. It serves as an intermediate in Mizoroki-Heck-type reactions. Furthermore, it is used as an initiator in anionic polymerization of carbazolyl-substituted oxiranes. It catalyzes the reaction of hydrosilanes and heterocyclic compounds to give the silyl derivatives with evolution of hydrogen.

Note

Air and moisture sensitive. Keep the container tightly closed in a dry and well-ventilated place. Incompatible with water, acids, reducing agents, oxygen, alcohols, chlorinated solvents, halogens and ketones.

Letteratura

Strong base of relatively low nucleophilicity. Review: Chem. Rev., 74, 45 (1974). The nucleophilicity is increased in the presence of 18-crown-6; the basic strength less so: J. Org. Chem., 43, 447 (1978).

For generation of dibromocarbene, see Bromoform, A11904. In combination with a solid-liquid phase-transfer catalyst in the absence of solvent, has been recommended for the dehydrobromination of alkyl bromides to alkenes: J. Org. Chem., 49, 1138 (1984): with 18-crown-6, is effective for the dehydrobromination of vic-dibromides: Liebigs Ann. Chem., 1 (1980), and in the dehydrochlorination of gem-dichloroalkanes to give alkynes: J. Org. Chem., 39, 3285 (1974).

Deprotonation of an ɑ-halo sulfone, followed by Ramberg-Backlund reaction with extrusion of SO2, gives an alkene: J. Am. Chem. Soc., 110, 4866 (1988); Org. React., 25, 1 (1977); Org. Synth. Coll., 8, 212 (1993):

For cyclization-elimination of ɑɑ-dibromoneopentyl ketone to di-tert-butylcyclopropenone, a precursor of tri-tert-butylcyclopropenium tetrafluoroborate, see: Org. Synth. Coll., 6, 991 (1988); for reaction scheme, see Neopentyl­ chloride, L02365.

For intramolecular cyclization of a dinitrile to an unsaturated vic-amino nitrile (Thorpe-Ziegler reaction), see: Org. Synth. Coll., 6, 932 (1988).

Treatment of a methyl ester in ether with the reagent provides a simple method for preparation of tert-butyl esters: Synlett, 658 (2001).

Combinations of KO-t-Bu with other strong bases are used to generate "superbasic" media, e.g. with n-BuLi: J. Organomet. Chem., 8, 9 (1967); Pure Appl. Chem., 60, 1627 (1988); Tetrahedron Lett., 29, 4991 (1988); see also Phenyl­acetyl­ene, A12139, 2-Methyl­indole, A10764, etc. In combination with Li 3-aminopropanamide, promotes the "zip" reaction for isomerizing alkynes to the terminal position; see 1,3-Diaminopropane, A11932, and Org. Synth. Coll., 8, 146 (1993). For use in combination with LDA for isomerization of epoxides to allylic alcohols, see Cyclohexene oxide, A13185.

Suzuki, C.; Kato, K.; Tsuji, A. B.; Zhang, M. R.; Arano, Y.; Saga, T. Inhibition of radical reactions for an improved potassium tert-butoxide-promoted 11C-methylation strategy for the synthesis of alfa-11C-methyl amino acids. J. Labelled Compd. Radiopharm. 2015, 58 (3), 127-132.

Midya, G. C.; Kapat, A.; Maiti, S.; Dash, J. Transition-Metal-Free Hydration of Nitriles Using Potassium tert-Butoxide under Anhydrous Conditions. J. Org. Chem. 2015, 80 (8), 4148-4151.

Rischio GHS e dichiarazioni precauzionali

Dichiarazioni di rischio (UE): H228-H251-H314-H318

Flammable solid. Self-heating: may catch fire. Causes severe skin burns and eye damage. Causes serious eye damage.

Dichiarazioni precauzionali: P210-P260-P280-P303+P361+P353-P305+P351+P338-P301+P330+P331-P304+P340-P310-P405-P501a

Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Do not breathe dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Immediately call a POISON CENTER or doctor/physician. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Altri riferimenti

Beilstein
3556712
Classe di rischio
4.2
Gruppo di imballaggio
II
Codice tariffe armonizzato
2905.19
TSCA
Yes

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