Rhodium(I), Palladium(II) and Platinum(II) Coordination Chemistry of the Short‐Bite Chiral Ligands (S_c)‐N,N‐Bis(diphenylphosphanyl)‐sec‐butylamine, (R_a,R_a)‐N,N‐Bis(binaphthylphosphonito)phenylamine and (R_a,S_c)‐N‐(Diphenylphosphanyl)‐N‐(binaphthylphosphonito)‐sec‐butylamine

Abstract

The new short-bite chiral ligands (S c )-N,N-bis(diphenylphosphanyl)-sec-butylamine [(S

[N,N-Bis(diphenylphosphanyl)-(R)-1,2,3,4-tetrahydro-1-naphthylamine-κ2P,P′]dichloroplatinum(II)

“…The chelating ligand forms a four-membered ring with Pt. The geometry of (I) is in close agreement with that of the secbutylamine analogue (Calabrò et al, 2004).…”

Chelating versus bridging bonding modes of N-substituted bis(diphenylphosphanyl)amine ligands in Pt complexes and Co2Pt clusters

“…Addition of dichloromethane (50 cm 3 ), filtration on Celite and evaporation of the solvent gave the amine as a dense pale yellow liquid (5.27 g, 78%);. m/z (EI) 161 (M + , 11%), 144 (9)…”

Effect of chelating vs. bridging coordination of chiral short-bite P–X–P (X = C, N, O) ligands in enantioselective palladium-catalysed allylic substitution reactions

“…5d We confirmed that the N,N-bis(diphosphino)alkylamines coordinate as chelating ligand by an X-ray diffraction structural determination on [M(S c -3)Cl 2 ] (M = Pd, Pt) complexes. 13 The diphosphinoamines and diphosphonitoamines chiral ligands have been synthesised by the reaction of the corresponding primary amine RNH 2 (R = Ph, (S c )-(ϩ)-sec-CHC 2 H 5 CH 3 ) with the diphenylchlorophosphine or (R a )-6, in the molar ratio 1 : 2, in toluene at 0 ЊC, in the presence of an excess of NEt 3 . Differently from the other P-N-P ligands here reported, (S c )-3 shows in the 31 P{ 1 H} NMR spectrum, in CDCl 3 , at 298 K, a broad signal at δ 49.6; this signal, at 220 K, raises two doublets centred at δ 52.9 and 42.9, with 2 J PP of 24.0 Hz.…”