1. N-heterocyclic carbenes rhodium complexes: conformational analysis and catalytic studies
- Author
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SOLINAS, GAVINO, BUSETTO, LUIGI, CASSANI, MARIA CRISTINA, FEMONI, CRISTINA, MANCINELLI, MICHELE, MAZZONI, RITA, GRUPPO INTERDIVISIONALE DI CHIMICA METALLORGANICA - SOCIETÀ CHIMICA ITALIANA, ICCOM-CNR FIRENZE, G. Solina, L. Busetto, M.C. Cassani, C. Femoni, M. Mancinelli, R. Mazzoni, GRUPPO GIOVANI DELLA SOCIETÀ CHIMICA ITALIANA, SIGMA ALDRICH, M. C. Cassani, G. Solinas, DIVISIONE DI CHIMICA INORGANICA - SOCIETÀ CHIMICA ITALIANA, and UNIVERSITÀ DI BOLOGNA
- Subjects
N-HETEROCYCLIC CARBENE ,CATALYSIS ,IMIDAZOLIUM SALTS ,RHODIUM COMPLEXES ,NMR - Abstract
Imidazolium salts incorporating functional groups represent a class of compounds having great versatility due to their wide range of applications as task specific ionic liquids (ILs)1 or N-heterocyclic carbene precursors (NHCs)2. Recently our research in this field has been dealing with the high-purity synthesis of t-butyloxylcarbonyl (Boc)-protected and deprotected amino-functionalized imidazolium cation [NHR1CH2CH2ImR2]+ ([1]+, R1 = Boc, H; R2 = Me, Bz, Allyl) and related NHC-Ag(I) silver complexes have been obtained by reacting [1]+ with Ag2O.3 Here we report the synthesis of new NHC-Rh(I) (2) complexes that contain an axis of chirality. The enantiomerical inversion has been investigated by variable-temperature NMR spectroscopy, DFT calculation and X-ray diffraction. The catalytic behaviour of 2 in the 1,2 addition reaction of aryl aldehydes with boronic acid will be also presented and discussed.
- Published
- 2010