title: Steric control in the oligomerisation of phosphazane dimers; towards new phosphorus-nitrogen macrocycles.
abstract: The reaction of [ClP(mu-NtBu)]2 (1) with H2O (1 : 2 equivalents) in the presence of excess Et3N gives the new chain compound [(mu-O)[P(mu-NtBu)2P(H)=O]2] (3), consisting of two P2N2 rings linked by a mu-O atom and terminating in P(V)(H)=O groups. A similar chain species is obtained from the reaction of the lithiate of [(tBuNH)P(mu-NtBu)2P(H)=O] (5) with [ClP(mu-NtBu)2P(NHtBu)] (2), the product being [(mu-O)[P(mu-NtBu)2P(NHtBu)]2] (6). Compounds 3 and 6 are the first examples of O-bridged chain phosphazanes and potential precursors to new phosphorus-nitrogen macrocycles. The syntheses and X-ray structures of 3, 5 and 6 are reported.
authors.affiliation: Chemistry Department,University of Cambridge, Lensfield Road, Cambridge, UKCB2 1EW.
authors.forename: Emma L
authors.initials: EL
authors.lastname: Doyle
authors.forename: Felipe
authors.initials: F
authors.lastname: García
authors.forename: Simon M
authors.initials: SM
authors.lastname: Humphrey
authors.forename: Richard A
authors.initials: RA
authors.lastname: Kowenicki
authors.forename: Lucía
authors.initials: L
authors.lastname: Riera
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Woods
authors.forename: Dominic S
authors.initials: DS
authors.lastname: Wright