title: Acyclic catena-diphosphinodiphosphonium dications [R3P-PR'-PR'-PR3]2+ or bisphosphine-diphosphenium complexes [R3PPR'-PR'PR3]2+: synthesis by reductive P-P coupling of [R3P-PR'Cl]+ and phosphine ligand exchange.
abstract: The acyclic tetraphosphorus dication [Ph3P-PPh-PPh-PPh3]2+ has been formed by the reductive coupling of [Ph3P-PPhCl]+, providing a new synthetic method for the systematic development of catena-phosphorus cations. Ligand exchange (Ph3P for Me3P) gives [Me3P-PPh-PPh-PMe3]2+, implicating these dications as bisphosphine-diphosphenium complexes.
authors.affiliation: Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada.
authors.forename: C Adam
authors.initials: CA
authors.lastname: Dyker
authors.forename: Neil
authors.initials: N
authors.lastname: Burford
authors.forename: Michael D
authors.initials: MD
authors.lastname: Lumsden
authors.forename: Andreas
authors.initials: A
authors.lastname: Decken