911641-72-0Relevant academic research and scientific papers
Novel methinic functionalized and dendritic C-scorpionates
Martins, Luísa M.D.R.S.,Wanke, Riccardo,Silva, Telma F.S.,Pombeiro, Armando J.L.,Servin, Paul,Laurent, Régis,Caminade, Anne-Marie
, (2018/11/30)
The study of chelating ligands is undoubtedly one of the most significant fields of research in chemistry. The present work is directed to the synthesis of new functionalized derivatives of tripodal C-scorpionate compounds. Tris-2,2,2-(1-pyrazolyl)ethanol, HOCH2C(pz)3 (1), one of the most important derivatives of hydrotris(pyrazolyl)methane, was used as a building block for the synthesis of new functionalized C-scorpionates, aiming to expand the scope of this unexplored class of compounds. The first dendritic C-scorpionate was successfully prepared and used in the important industrial catalytic reactions, Sonogashira and Heck C-C cross-couplings.
Dendronized scorpionate complexes of molybdenum in low and high oxidation states
Sanchez-Mendez, Alberto,Ortiz, Alba M.,De Jesus, Ernesto,Flores, Juan C.,Gomez-Sal, Pilar
, p. 5658 - 5669 (2008/09/17)
Tridentate (L3) and bidentate (L2) poly(pyrazolyl)methane ligands (Gn-dend)OCH2C(pz)3 (1-4) and (Gn-dend)CH(3,5-Me2pz)2 (pz = pyrazol-1-yl) have been used to synthesize the molybdenum(0) complexes [Mo(CO)3(L 3)] (G0-G3, 5-8), [Mo(CO)4(L2)] (G0-G1, 13-14), and [Mo(CO)3(NCMe)(L2)] (G0, 15), and the molybdenum(vi) complexes [MoCl2O2(L2)] (9-12). The G0-G3 prefixes represent the generation of poly(aryl ether) dendrons in which the metal complexes are embedded. The molecular structures of compounds 13 and 15 have been determined by X-ray diffraction studies and the hydrodynamic radii of tricarbonyl complexes 5-8 calculated by diffusion-ordered NMR spectroscopy (DOSY). Molybdenum(vi) compounds 9-12 have also been evaluated as catalysts for olefin epoxidation, showing comparable but inferior performances than ligand-free MoCl2O2, probably because of the labile coordination of L2. The Royal Society of Chemistry.
