期刊
POLYHEDRON
卷 61, 期 -, 页码 248-252出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2013.06.010
关键词
Rhodium; Hydroalkoxylation; Catalysis; Tris(imidazolyl)methanol
资金
- University of New South Wales
- Australian Research Council
- Australian government
Rhodium(l) dicarbonyl complexes 1-4 containing chelating N-donor ligands bis(pyrazolyl)methane (bpm), bis(imidazolyl)methane (bim), tris(pyrazolyl)toluidine (tpt) or tris(imidazolyl)methanol (tim) were investigated as catalysts for the hydroalkoxylation of alkynyl benzoic acids (5a-g). The regioselectivity of the reaction was shown to be highly dependent on the nature of the terminal alkyne substituent (R) of the alkynol substrate. It was also determined that the presence of a third uncoordinated N-donor group in complexes 3 and 4 suppressed the catalytic efficiency of these complexes, and that the selectivity of the reaction for forming either endocyclic (6) or exocyclic (7) hydroalkoxylation products was influenced by the pendant hydroxyl group present in complex 4. We used C-13 NMR spectroscopy to quantify the polarity of the alkynyl benzoic acid C C bond and our efforts to correlate this measure of bond polarity to the observed regioselectivity of the reaction are discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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