1331876-80-2Relevant academic research and scientific papers
Synthesis, complexation behavior and application of a new diphosphite ligand in rhodium-catalyzed hydroformylation
Mikhel, Igor S.,Dubrovina, Natalia V.,Shuklov, Ivan A.,Baumann, Wolfgang,Selent, Detlef,Jiao, Haijun,Christiansen, Andrea,Franke, Robert,Boerner, Armin
, p. 3050 - 3057 (2011)
Oxidative coupling of 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid methyl ester (2) gave dimethyl 3,3′-(5,5′-di-tert-butyl-6,6′- dihydroxybiphenyl-3,3′-diyl)-dipropionate (1c), which upon phosphorylation/transesterification with a phosphochloridite derived from (R)-binaphthol, formed the new unsymmetrical binaphthol-bridged diphosphite 4. A rhodium catalyst based on 4 as ligand gave predominantly iso-selectivity in the hydroformylation of selected styrenes but opposite regioselectivity with 2,6-disubstituted derivatives. New chelate metal complexes (acac)RhL, PdCl 2L and PtCl2L have been synthesized by reacting 4 with (acac)Rh(CO)2, PdCl2(MeCN)2 and PtCl 2(COD), respectively. The structure of obtained compounds is determined based on 1H, 13C, 31P and 195Pt NMR spectroscopy and mass spectrometry data.
