title: Coordination chemistry of new selective ethylene trimerisation ligand Ph2PN(iPr)P(Ph)NH(R) (R = iPr, Et) and tests in catalysis.
abstract: The synthesis of [Ph(2)PN((i)Pr)P(Ph)NH(R)] (R = (i)Pr, Et) (1, 2) is described and the structure of 2 has been determined by single-crystal X-ray analysis. Compound 1 readily reacts with chromium(0), nickel(0), nickel(II), palladium(II), platinum(II) and iron(II) complexes to give four-membered rings (3-10) via P,P' coordination. The molecular structures of [Cr(CO)(4){Ph(2)PN((i)Pr)P(Ph)NH(R)-P,P'}] (R = (i)Pr, Et) (3, 4), [Cr(CO)(3)(NCCH(3)){Ph(2)PN((i)Pr)P(Ph)NH((i)Pr)-P,P'}] (5), [Ni{Ph(2)PN((i)Pr)P(Ph)NH((i)Pr)-P,P'}(2)] (6), cis-[MX(2){Ph(2)PN((i)Pr)P(Ph)NH((i)Pr)-P,P'}] (M = Ni, Pd, Pt; X = Cl or Br) (7, 8, 9) and trans-[Fe(NCCH(3))(2){Ph(2)PN((i)Pr)P(Ph)NH((i)Pr)-P,P'}(2)](BF(4))(2) (10) have been determined by X-ray diffraction. In the solid state, these complexes show tight phosphine bite angles in the range 67.89(2) degrees to 74.97(4) degrees and the central nitrogen atom adopts an almost planar (sp(2)) geometry. Complexes 3, 5, 6, 7 and 10 are tested for their catalytic activity in ethylene oligomerisation. Additionally, complex 10 is tested in hydrogenation of olefins.
authors.affiliation: Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059, Rostock, Germany.
authors.forename: Bhaskar Reddy
authors.initials: BR
authors.lastname: Aluri
authors.forename: Normen
authors.initials: N
authors.lastname: Peulecke
authors.forename: Stephan
authors.initials: S
authors.lastname: Peitz
authors.forename: Anke
authors.initials: A
authors.lastname: Spannenberg
authors.forename: Bernd H
authors.initials: BH
authors.lastname: Müller
authors.forename: Stefan
authors.initials: S
authors.lastname: Schulz
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Drexler
authors.forename: Detlef
authors.initials: D
authors.lastname: Heller
authors.forename: Mohammed H
authors.initials: MH
authors.lastname: Al-Hazmi
authors.forename: Fuad M
authors.initials: FM
authors.lastname: Mosa
authors.forename: Anina
authors.initials: A
authors.lastname: Wöhl
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Müller
authors.forename: Uwe
authors.initials: U
authors.lastname: Rosenthal