Formation of elastomeric polypropylene promoted by the dynamic complexes [TiCl2{N(PPh2)2}2] and [Zr(NPhPPh2)4]

Novel Mercury Phosphanylamides

“…Two equal intensity and very broadened resonances in the 31 P{ 1 H} NMR spectrum at δ = 71.0 and 37.2 ppm, can be assigned to P(2,4,6) on the lower coordinate mercury and P(1,3,5) of 4 respectively. There is also a resonance at δ = 45.8 ppm attributable to (protonated) (Ph 2 P) 2 NH, [5] in the appropriate ratio to 4 consistent with the formation of 4·3/2 CDCl 3 by protolysis/deuterolysis (see vii in Scheme 1). The 1 H NMR spectrum of the crude product displays solely the expected protons from phenyl groups (7.8 to 6.9 ppm) and a resonance attributable to the amine proton of (Ph 2 P) 2 NH (δ = 3.1 ppm).…”

“…butyllithium) or alkoxides. [5] The resulting bis(diphenylphosphanyl)amide ligand is an isoelectronic analogue of dppm that has so far demonstrated an ability to bridge, two are five coordinate. In [Hg 2 {μ 2 -(Ph 2 P) 2 N} 2 {(Ph 2 P)(OPPh 2 )-N} 2 ]·2S [S = C 7 H 8 or C 4 H 10 O 2 (1,2-dimethoxyethane)], the mercury atoms are bridged (P,PЈ) by two phosphanylamide ligands, whilst the hemi-oxidised ligands are chelating (O,P) in a transoid disposition to each other leading to four coordination.…”

“…(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) chelate or act as a terminal ligand for transition metals [5][6][7] and, more recently, lanthanoid metals by coordination through the amide and the phosphorus donor sets. [1b,8] Another interesting feature of the bis(diphenylphosphanyl)amine ligand is the ability of the phosphorus atoms to be sequentially oxidised by selected chalcogen elements (E = O, S, Se), thereby forming the new derivatives (PPh 2 )[P(E)Ph 2 ]NH and [P(E)Ph 2 ] 2 NH.…”

Synthesis, structure and ethylene polymerization of group 4 complexes with phosphinoamide ligands

“…To the best of our knowledge, there are no reports on the use of group 4 complexes with diphosphinoamide ligands for ethylene polymerization. Kühl et al 22 reported the homoleptic phosphinoamide complex Zr(NPhPPh 2 ) 4 , which showed very low activity for propylene polymerization in liquid propylene.…”

Synthesis and Characterization of Lithium Complexes of 2‐(Diphenylphosphanylamino)pyridine and N,2‐Bis(diphenylphosphanyl)benzeneamine

“…Seemingly, this interaction induces a higher energy and is observed only when no other donating atoms are present in sterically less demanding positions. [28] Comparison of the neutral and lithiated complexes shows that the increase in charge at the nitrogen atom causes almost no change in aromatic CϪC bond lengths, although the bonds connecting the substituents to the aromatic ring do lengthen, i.e. C (13)ϪC (18) (18) ϭ Table 3.…”