Rhodium(i) complexes bearing N-donor ligands: catalytic activity towards intramolecular cyclization of alkynoic acids and ligand lability
作者:Bradley Y.-W. Man、Mohan Bhadbhade、Barbara A. Messerle
DOI:10.1039/c1nj20094a
日期:——
structures of rhodium(I) complexes bearing tris(pyrazol-1-yl)toluidine (tpt) and tris(N-methylimidazol-2-yl)methanol (tim) ligands were examined in the solid state using single crystal X-ray diffraction, and in the solution state using variable temperature NMR spectroscopy. The solid state structures of the rhodium(I) tpt and rhodium(I) tim complexes showed that the ligands are bound to the rhodium(I) centre
A Practical Synthesis of Tris(pyrazolyl)methylaryls
作者:Brendan J. Liddle、James R. Gardinier
DOI:10.1021/jo701924w
日期:2007.12.1
[Graphics]The preparation of three tris(pyrazolyl)toluidines from trifluoromethylaniline reagents is described that likely takes advantage of (quinoidal) resonance-stabilized activation of the C-F bonds. Subsequent transformations lead to two additional (for a total of five new) tris(pyrazolyl)methylaryls. This simple reaction is remarkable because only one other tris(pyrazolyl)methylaryl has been reported previously, because it is usually very difficult to activate fluoroalkane C-F bonds, and because of the potential scope of the reaction.