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2857-97-8 - Bromotrimethylsilane, 97%, stab. with copper powder or silver wire - TMS bromide - Trimethylbromosilane - A15334 - Alfa Aesar

A15334 Bromotrimethylsilane, 97%, stab. with copper powder or silver wire

Codice CAS
2857-97-8
Sinonimi
TMS bromide
Trimethylbromosilane

Dimensioni Prezzo ($) Quantità Disponibilità
10g 35,80
50g 119,00
250g 451,00
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Bromotrimethylsilane, 97%, stab. with copper powder or silver wire

MDL
MFCD00000048
EINECS
220-672-0

Proprietà chimiche

Formula
C3H9BrSi
Peso formula
153.09
Punto di fusione
-44°
Punto di ebollizione
78-80°
Punto di infiammabilità
-3°(26°F)
Densità
1.183
Indice di rifrazione
1.4250
Sensibilità
Moisture Sensitive
Solubilità
Miscible with carbon tetrachloride, chloroform, dichloroethane, acetonitrile, toluene, dichloromethane and hexane.

Applicazioni

Bromotrimethylsilane is used as a mild and selective reagent for cleavage of lactones, epoxides, acetals, phosphonate esters and certain ethers. Further, it is used as a brominating agent and an effective reagent for the formation of silyl enol ethers.

Note

Moisture sensitive. Store in a cool place. Incompatible with strong acids, water and strong oxidizing agents.

Letteratura

Silylating agent; see Appendix 4. About 104x more reactive than TMSCl in the conversion of ketones to their silyl enol ethers in the presence of Et3N: Liebigs Ann. Chem., 1718 (1980).

Converts alcohols to alkyl bromides: Tetrahedron Lett., 4483 (1978), and acyl chlorides to acyl bromides: Synthesis, 216 (1981).

Acetals, including MOM and THP ethers are readily cleaved, as are trityl and TBDMS ethers: Tetrahedron Lett., 25, 2515 (1984). Methyl glycosides are converted to the glycosyl bromides: Tetrahedron Lett., 22, 513 (1981).

Epoxides, oxetanes and THF are cleaved by the reagent: Synthesis, 383 (1981), as are small ring lactones: Angew. Chem. Int. Ed., 18, 689 (1979). The cleavage of acyclic ethers and esters is markedly catalyzed by IBr: J. Org. Chem., 48, 1678 (1983).

In combination with DMSO and Et3N, effects the bromolactonization of unsaturated acids: J. Chem. Soc., Perkin 1, 847 (1994).

Effective catalyst for Michaelis-Arbuzov rearrangement of trivalent organophosphorus P-O-R compounds to the corresponding P=O derivatives: Org. Lett., 5, 1661 (2003).

Compare also Iodotrimethyl­silane, A12902.

Ferry, L.; Dorez, G.; Taguet, A.; Otazaghine, B.; Lopez-Cuesta, J. M. Chemical modification of lignin by phosphorus molecules to improve the fire behavior of polybutylene succinate. Polym. Degrad. Stab. 2015, 113, 135-143.

Willkomm, J.; Muresan, N. M.; Reisner, E. Enhancing H2 evolution performance of an immobilised cobalt catalyst by rational ligand design. Chem. Sci. 2015, 6, 2727-2736.

Rischio GHS e dichiarazioni precauzionali

Dichiarazioni di rischio (UE): H225-H314-H318

Highly flammable liquid and vapour. Causes severe skin burns and eye damage. Causes serious eye damage.

Dichiarazioni precauzionali: P210-P260u-P303+P361+P353-P305+P351+P338-P405-P501a

Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Do not breathe dusts or mists. 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. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Altri riferimenti

Beilstein
1731135
Classe di rischio
3
Gruppo di imballaggio
II
Codice tariffe armonizzato
2931.90
TSCA
Yes

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