Structural and Catalytic Properties of Alkyl-Substituted Phosphanes. Effect of Ortho-Modification on Rhodium-Catalyzed 1-Hexene Hydroformylation
作者： Pekka Suomalainen , Helena Riihimäki , Sirpa Jääskeläinen , Matti Haukka , Jouni T. Pursiainen
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摘要: The influence of the alkyl-substituted phosphanes (o-methylphenyl)diphenylphosphane (o-MeP), (o-ethylphenyl)diphenylphosphane (o-EtP), bis(o-methylphenyl)phenylphosphane (o-Me2P), bis(o-ethylphenyl)phenylphosphane (o-Et2P), and (2,4,5-trimethylphenyl)diphenylphosphane (2,4,5-MeP) was screened in model reaction rhodium-catalyzed 1-hexene hydroformylation. Compared with PPh3, prepared afforded lower chemoselectivity towards aldehydes, but increased normal to branched ratio. Catalyst results are discussed relation stereoelectronic properties phosphane ligands. Electron donor capacity ligands studied terms spectroscopic data trans-RhCl(CO)P2 species, formed between Rh2(μ-Cl)2(CO)4 (P). Furthermore, steric attributes free bound were investigated by Tolmans cone angle method. Crystal structures for o-EtP, o-Me2P, o-Et2P, complexes trans-Rh(CO)Cl(o-MeP)2 trans-Rh(CO)Cl(o-Et2P) solved as well.
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