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696188

Sigma-Aldrich

1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene

97%

Sinonimo/i:

1,3-Bis(2,4,6-trimethylphenyl)imidazol-2-ylidene

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About This Item

Formula empirica (notazione di Hill):
C21H24N2
Numero CAS:
141556-42-5
Peso molecolare:
304.43
Numero MDL:
MFCD09265338
Codice UNSPSC:
12352005
ID PubChem:
329761806
NACRES:
NA.22

Livello qualitativo

100

Saggio

97%

Forma fisica

powder

Impiego in reazioni chimiche

reagent type: catalyst

Punto di fusione

140 °C

Temperatura di conservazione

−20°C

Stringa SMILE

Cc1cc(C)c(N2[C]N(C=C2)c3c(C)cc(C)cc3C)c(C)c1

InChI

1S/C21H24N2/c1-14-9-16(3)20(17(4)10-14)22-7-8-23(13-22)21-18(5)11-15(2)12-19(21)6/h7-12H,1-6H3
JCYWCSGERIELPG-UHFFFAOYSA-N

Applicazioni

1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene (IMes) is a nucleophilic N-heterocyclic carbene (NHC) ligand.
It can be used to synthesize:
  • IMes ligated-rhodium complex as a catalyst for the selective hydrogenation of substituted aryl and heteroaryl boronate esters to cis-substituted borylated cycloalkanes.
  • IMes/ruthenium complex (Cp*Ru(IMes)Cl)(Cp* =η5-C5Me3) as a catalyst for olefin ring closing metathesis reaction.


IMes is also used as an ancillary ligand in Pd-catalyzed Suzuki-Miyaura cross-coupling reaction between aryl chlorides or aryl triflates and arylboronic acids.

Pittogrammi

FlameExclamation mark
GHS02,GHS07

Avvertenze

Warning

Indicazioni di pericolo

H228,H315,H319,H335

Classi di pericolo

Eye Irrit. 2 - Flam. Sol. 2 - Skin Irrit. 2 - STOT SE 3

Organi bersaglio

Respiratory system

Codice della classe di stoccaggio

4.1B - Flammable solid hazardous materials

Classe di pericolosità dell'acqua (WGK)

WGK 3

Punto d’infiammabilità (°F)

Not applicable

Punto d’infiammabilità (°C)

Not applicable

Dispositivi di protezione individuale

Eyeshields, Gloves, type P3 (EN 143) respirator cartridges

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Certificati d'analisi (COA)

Lot/Batch Number
MKCQ0826
MKCN1371
MKCJ2291
MKCF4106
MKCB3521

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Olefin metathesis-active ruthenium complexes bearing a nucleophilic carbene ligand
Huang J, et al.
Journal of the American Chemical Society, 121(12), 2674-2678 (1999)
Hydrogenation of (Hetero) aryl Boronate Esters with a Cyclic (Alkyl)(amino) carbene-Rhodium Complex: Direct Access to cis-Substituted Borylated Cycloalkanes and Saturated Heterocycles
Ling L, et al.
Angewandte Chemie (International Edition in English), 58(20), 6554-6558 (2019)
Gilles Schnee et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(49), 17959-17972 (2015-10-21)
The present contribution reports experimental and theoretical mechanistic investigations on a normal-to-abnormal (C2-to-C4-bonded) NHC rearrangement processes occurring with bulky group 13 metal NHC adducts, including the scope of such a reactivity for Al compounds. The sterically congested adducts (nItBu)MMe3 (nItBu=1,3-di-tert-butylimidazol-2-ylidene;
Suzuki- Miyaura cross-coupling reactions mediated by palladium/imidazolium salt systems
Grasa GA, et al.
Organometallics, 21(14), 2866-2873 (2002)
Thi Kim Hoang Trinh et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 25(39), 9242-9252 (2019-04-26)
In the search of smarter routes to control the conditions of N-heterocyclic carbene (NHCs) formation, a two-component air-stable NHC photogenerating system is reported. It relies on the irradiation at 365 nm of a mixture of 2-isopropylthioxanthone (ITX) with 1,3-bis(mesityl)imidazoli(ni)um tetraphenylborate. The

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