130574-11-7

Basic information

• Product Name: {(N,N-bis(2-(diphenylphosphino)ethyl)-n-propylamine)Ir(η4-cycloocta-1,5-diene)}BPh4
• Synonyms: {(N,N-bis(2-(diphenylphosphino)ethyl)-n-propylamine)Ir(η4-cycloocta-1,5-diene)}BPh4
• CAS NO: 130574-11-7
• Molecular Weight: 1103.21
• Mol File: 130574-11-7.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: {(N,N-bis(2-(diphenylphosphino)ethyl)-n-propylamine)Ir(η4-cycloocta-1,5-diene)}BPh4(CAS DataBase Reference)
• NIST Chemistry Reference: {(N,N-bis(2-(diphenylphosphino)ethyl)-n-propylamine)Ir(η4-cycloocta-1,5-diene)}BPh4(130574-11-7)
• EPA Substance Registry System: {(N,N-bis(2-(diphenylphosphino)ethyl)-n-propylamine)Ir(η4-cycloocta-1,5-diene)}BPh4(130574-11-7)

Safety Data

• Hazardous Substances Data: 130574-11-7(Hazardous Substances Data)

Upstream product

• 30824-25-0 N,N-bis<2-(diphenylphosphino)ethyl>-n-propylamine 
• 143-66-8 sodium tetraphenyl borate 

Relevant articles and documents

Electron-rich iridium complexes with mixed-donor polydentate ligands. Chemoselective catalysts in hydrogen-transfer reduction of α,β-unsaturated ketones

The mixed-donor polydentate ligands Prn-N(CH2CH2PPh2)2 (PNP) and Et2NCH2CH2N(CH2CH 2PPh2)2 (P2N2) react in THF with [Ir(cod)(OMe)]2 (cod = cycloocta-1,5-diene) yielding the σ,η2-cyclooctenyl complexes [(PNP)Ir(σ,η2-C8H13)] (1) and [(P2N2)Ir(σ,η2-C8H 13)] (2). The crystal structure of 1 has been determined by X-ray methods. The iridium atom is coordinated to the phosphorus and nitrogen donors of PNP and to a cyclooctenyl group via σ and η bonding in a distorted trigonal-bipyramidal geometry. The same coordination geometry is assigned to the P2N2 derivative that exhibits a free diethylamino group. In solution, above ca. -30°C, compounds 1 and 2 are in equilibrium with the hydride η4-cod isomers [(PNP)IrH(η4-cod)] (3) and [(P2N2)IrH(η4-cod)] (4) via a β-H elimination/hydride migration pathway. The equilibrium constants for the 1 ? 3 and 2 ? 4 interconversions have been obtained at different temperatures by 31P NMR integration in the range 298-348 K. The thermodynamic functions ΔHo and ΔSo for the 1 ? 3 and 2 ? 4 isomerization reactions have been calculated. They are rather similar with each other, but the enthalpy contribution appears slightly more favorable for the latter reaction, in nice accord with the higher concentration of the hydride species observed for the P2N2 system at comparable temperatures. Compounds 1 and 2 are good catalyst precursors for the chemoselective hydrogen-transfer reduction of α,β-unsaturated ketones such as benzylidencacetone to allylic alcohols. The catalytic activity of 1 and 2 has been compared and contrasted to that exhibited by the system "[Ir(cod)(OMe)]2 + PNP or P2N2" prepared in situ as well as other related complexes like [(PNP)Ir(η4-cod)]BPh4 (5), [(P2N2)Ir(η4-cod)]BPh4 (6), [(triphos)Ir(σ,η2-C8H13)] (7) and [(triphos)Ir(σ,η2-C8H13)]BPh 4 (8) [triphos = MeC(CH2PPh2)3]. Through this comparison, valuable mechanistic information on the catalysis cycle has been obtained.