Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Highly Active and Selective Ru‐PNH Catalyst in Aerobic Oxidation of Benzyl Amines
Ist Teil von
ChemCatChem, 2019-09, Vol.11 (18), p.4624-4630
Ort / Verlag
Weinheim: Wiley Subscription Services, Inc
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Wiley Blackwell Single Titles
Beschreibungen/Notizen
Set of [Ru(η6‐cymene)(R)XCl] (R=L1SnCl, L1GeCl L2PPh2, X=Cl or SnCl3, L1=[2‐(CH2NEt2)‐4,6‐(tBu)2C6H2]−, L2=2,6‐iPr2‐C6H3‐NH−) catalysts was tested in aerobic oxidations of primary amines. The activity of studied catalysts depends on the charge of the Ru atom that has been influenced either by donating ligands R or by character of X. Typical Ru/P catalyst [Ru(η6‐cymene)(L2PPh2)Cl2] (3) with least negative charge on the Ru atom has been observed as the most effective. The design of the phosphine ligand L2 containing amino‐phosphine PNH moiety provided efficient anchoring of complex 3 to silica gel via hydrogen bonding of the PNH functional group to SiO2 to give heterogeneous catalyst 3‐silica. This complex has been also efficiently tested in aerobic oxidation as recyclable catalyst with cumulative TON up to 6930.
Aerobics with a ruthenium twist: Complex [Ru(η6‐cymene)(L2PPh2)Cl2] (3) has been found as the effective homogenous catalyst in aerobic oxidation of benzyl amines to imines. Its anchoring to silica gel via hydrogen bonding of PNH group provided highly active heterogeneous catalyst 3‐silica, that provided cumulative TON up to 6930.