Iridium and rhodium "PNP" aminodiphosphine complexes used as catalysts in the oxidation of styrene. Issue 37 (29th March 2016)

• Record Type: Journal Article
• Authors: Naicker, Dunesha; Friedrich, Holger B.; Pansuriya, Pramod B.
• Is Part Of: RSC advances. Volume 6:Issue 37(2016)
• Page Start: 31005
• Page End: 31013
• Publication Date: 2016-03-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra01276k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : New Ir and Rh "PNP" aminodiphosphine complexes are effective catalysts in styrene oxidation with tert -butyl hydroperoxide as the oxidant. The Ir catalysts were more active than the Rh catalysts with high yields to benzaldehyde in comparison to styrene oxide. Abstract : Six PNP or aminodiphosphine ligands were synthesized and complexed to the transition metals iridium and rhodium to give [(η 5 -C5 Me5 )MCl{η 2 - P, P ′-(PPh2 )2 NR}]PF6, where M = Ir (1 ) and Rh (2 ) and R = cyclohexyl (a ), iso-propyl (b ), pentyl (c ), phenyl (d ), chlorophenyl (e ) and methoxyphenyl (f ). These complexes were fully characterized by NMR, elemental analyses and IR spectroscopy. Crystals of1f and2f were obtained, which showed a distorted octahedral geometry around the metal centers. These complexes showed good activity in the oxidation of styrene using tert -butyl hydroperoxide (TBHP) as the oxidant. The iridium complexes were more active than the rhodium complexes. Higher yields for benzaldehyde were achieved in comparison to styrene oxide for all catalysts.