title: A bisphosphonite calix[5]arene ligand that stabilizes η6 arene coordination to palladium.
abstract: Treatment of a bis(phenylphosphonite)calix[5]arene ligand with either palladium(II) chloride or 1,5-cyclooctadieneplatinum(II) chloride yields square planar metal complexes in which the two phosphorus atoms bind cis to the MCl(2) moiety (M = Pd, Pt). Chloride was removed from the palladium complex to open a coordination site at the metal for catalysis. The chloride removal resulted in a rare and unexpected η(6) coordination of an arene to the metal. The reaction is reversible upon addition of tetra-n-butyl ammonium chloride.
authors.affiliation: Department of Chemistry, Southern Methodist University, Dallas, Texas 75275, USA.
authors.forename: Beatriz E
authors.initials: BE
authors.lastname: Rios
authors.forename: Paul
authors.initials: P
authors.lastname: Sood
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Klichko
authors.forename: Mohan
authors.initials: M
authors.lastname: Koutha
authors.forename: Douglas
authors.initials: D
authors.lastname: Powell
authors.forename: Michael
authors.initials: M
authors.lastname: Lattman