کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1307023 | 975115 | 2009 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The synthesis and X-ray structure of a chiral rhodium–NHC complex: Implications for the use of NHCs in asymmetric hydroformylation catalysis The synthesis and X-ray structure of a chiral rhodium–NHC complex: Implications for the use of NHCs in asymmetric hydroformylation catalysis](/preview/png/1307023.png)
An optically active N-heterocyclic carbene (NHC) has been metallated with [RhCl(COD)]2 to give a rhodium(I) monocarbene substituted complex. This complex has been fully characterized by 1H and 13C NMR spectroscopy and by single-crystal X-ray analysis. Preliminary tests of hydroformylation of styrene catalyzed with this compound have shown that branched to linear aldehyde ratio was rather low 0.67 (40%) and that the enantiomeric excess measured on the corresponding alcohols was only 10%. In the presence of an excess of triphenylphosphine, the ratio of branched to linear aldehyde increased markedly (91%) whereas the enantioselectivity of the reaction remained almost unchanged (12.5%).
The synthesis of a new optically active rhodium(I) NHC complex is described and its structure determined by single-crystal X-ray diffraction. Preliminary tests of asymmetric hydroformylation of styrene with this compound are reported.Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 362, Issue 13, 15 October 2009, Pages 4849–4852