title: Binucleating behaviour of a proximally-diphosphinated calix[4]arene.
abstract: The long diphosphine 5,11-diphenylphosphanyl-25,26-dipropyloxy-27,28-bis(2-propenyloxy) calix[4]arene (cone) (5), in which the two phosphorus atoms are separated by a semi-rigid linking unit, was prepared in four steps starting from calix[4]arene. Reaction of 5 with AuCl(SEt(2)) or [RuCl(2)(p-cymene)](2) led to calixarenes bearing two metallated pendant arms, [5·(AuCl)(2)] and [5·{RuCl(2)(p-cymene)}(2)], respectively. In the presence of AgBF(4) or [Ni(C(5)H(5))(1,5-cyclooctadiene)]BF(4), diphosphine 5 displayed a marked tendency to form oligomeric material, but under high dilution conditions dimeric species were obtained selectively. The inability of 5 to form chelate complexes was further illustrated by its reaction with [PdCl(2)(1,5-cyclooctadiene)(2)], which led quantitatively to a rare complex in which a diphosphine spans across the dinuclear [PdCl(μ-Cl)(2)PdCl] unit.
authors: Laboratoire de Chimie Inorganique Moléculaire et Catalyse, Université de Strasbourg, Institut de Chimie UMR 7177 CNRS, 1 rue Blaise Pascal, F-67008 Strasbourg cedex, France.
authors: Mouhamad
authors: M
authors: Awada
authors: Catherine
authors: C
authors: Jeunesse
authors: Dominique
authors: D
authors: Matt
authors: Loic
authors: L
authors: Toupet
authors: Richard
authors: R
authors: Welter