| Autor: |
Viciu, M. S., Grasa, G. A., Nolan, S. P. |
| Zdroj: |
Organometallics; August 2001, Vol. 20 Issue: 16 p3607-3612, 6p |
| Abstrakt: |
A convenient and efficient catalytic aryl halide dehalogenation protocol has been developed using an imidazolium salt/palladium/base system. The use of the ligand precursor SIMes·HCl ((2,4,6-trimethylphenyl)dihydroimidazolium chloride) in conjunction with Pd(dba)2 was found to be most effective for the dehalogenation of aryl chlorides, bromides, and polyhalogenated aromatic hydrocarbons. Strong bases having β-hydrogens both perform deprotonation of the imidazolium salt and are hydrogen sources for the dehalogenation process. The oxidative addition of the imidazolium salt to the palladium(0) precursor generating a carbene palladium hydride species may also be involved in the dehalogenation process. This oxidative-addition reaction may have fundamental implications in low-valent metal carbene mediated transformations. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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