title: Low-valent chemistry: an alternative approach to phosphorus-containing oligomers.
abstract: A convenient preparative approach to low-valent phosphorus-rich oligomers is presented. Ligand substitution reactions involving anionic diphosphine ligands of the form [(PR2)2N](-) and [(PPh2)2C5H3](-) and a triphosphenium bromide P(I) precursor result in the formation of phosphorus(I)-containing heterocycles, several of which are of types that have never been prepared before. The methodology described also allows for the preparation of the known heterocycle cyclo-[P(PPh2)N(PPh2)]2 in better yields and purity than the synthetic approach reported previously. Preliminary reactivity studies demonstrate the viability of such zwitterionic oligomers as multidentate ligands for transition metals.
authors.affiliation: Department of Chemistry and Biochemistry, University of Windsor , Windsor, Ontario N9B 3P4, Canada.
authors.forename: Stephanie C
authors.initials: SC
authors.lastname: Kosnik
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Farrar
authors.forename: Erin L
authors.initials: EL
authors.lastname: Norton
authors.forename: Benjamin F T
authors.initials: BF
authors.lastname: Cooper
authors.forename: Bobby D
authors.initials: BD
authors.lastname: Ellis
authors.forename: Charles L B
authors.initials: CL
authors.lastname: Macdonald