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141556-45-8 - 1,3-Dimesitylimidazolium chloride, 96% - 1,3-Bis(2,4,6-trimethylphenyl)imidazolium chloride - H27535 - Alfa Aesar

H27535 1,3-Dimesitylimidazolium chloride, 96%

CAS-Nummer
141556-45-8
Synonyme
1,3-Bis(2,4,6-trimethylphenyl)imidazolium chloride

Größe Preis ($) Menge Verfügbarkeit
1g 61,49
5g 202,79
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1,3-Dimesitylimidazolium chloride, 96%

MDL
MFCD02684541

Chemische Eigenschaften

Formel
C21H25ClN2
Molmasse
340.89
Schmelzpunkt
>300°
Löslichkeit
Slightly soluble in water.

Anwendungen

Used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases. For use in the Pd-catalyzed cross-coupling of aryl Grignards with aryl chlorides (Kumada reaction). Many examples have been recorded of the use of NHC ligands in the Suzuki coupling reaction, for examples utilizing 1,3-dimesitylimidazol-2-ylidene, in the coupling of arylboronic acids with relatively unreactive aryl chlorides.

Bemerkungen

Store away from oxidizing agents. Keep the container tightly closed and place it in a cool, dry and well ventilated condition.

Literaturverweise

Colin D Abernethy, et al. Reaction of nickelocene with 1,3-dimesitylimidazolium chloride.J. Organomet. Chem.,2000,596(1-2), 3-5.

Ralf Jackstell, et al. Efficient telomerization of 1,3-butadiene with alcohols in the presence of in situ generated palladium(0)carbene complexes.J. Mol. Catal. A: Chem.,2002,185(1-2), 105-112.

In the presence of a base such as KO-t-Bu, generates the imidazol-2-ylidene, an example of an N-heterocyclic carbene (NHC). NHCs are relatively strong bases, and valuable replacements for phosphine ligands in transition metal chemistry. They are relatively stable to dimerization, but sensitive to air and moisture, so are best generated in situ. Review: Angew. Chem. Int. Ed., 36, 2163 (1997). For a review of stable carbenes, see: Chem. Rev., 100, 39 (2000).

Used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases. For use in the Pd-catalyzed cross-coupling of aryl Grignards with aryl chlorides (Kumada reaction), see: J. Am. Chem. Soc., 121, 9889 (1999). Many examples have been recorded of the use of NHC ligands in the Suzuki coupling reaction, for examples utilizing 1,3-dimesitylimidazol-2-ylidene, in the coupling of arylboronic acids with relatively unreactive aryl chlorides, see: J. Org. Chem., 64, 3804 (1999); J. Organomet. Chem., 595, 186 (2000); Tetrahedron Lett., 45, 3511 (2004). Has been found to give superior results to phosphines in the coupling of sulfonyl chlorides with boronic acids: Org. Lett., 6, 95 (2004).

The carbene has also been reported to be an excellent nucleophilic catalyst in transesterification reactions, milder, more selective and more active than conventional systems: Org. Lett., 4, 3583, 3587 (2002).

See also 1,3-Bis(2,6-diisopropyl­phenyl)­imidazolium chloride, H27150.

GHS Gefahren- und Sicherheitshinweise

Gefahrenhinweise (EU): H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Sicherheitshinweise: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Weitere Referenzen

Harmonized Tariff Code
2933.29
TSCA
No

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