title: Protonation of a xantphos-phosphole ligand. Intramolecular trapping of a P-H phospholium salt.
abstract: Protonation of a bidentate xantphos-phosphole ligand by HBF(4) affords only one enantiomer of a cyclic phospholium dihydropholene structure. DFT calculations allowed us to establish that protonation initially takes place at the phosphorus atom of the phosphole moiety to afford a transient P-H phospholium salt, which in turn protonates the C=C double bond of the second phosphole unit.
authors.affiliation: Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Escalle
authors.forename: Xavier F
authors.initials: XF
authors.lastname: Le Goff
authors.forename: Pascal
authors.initials: P
authors.lastname: Le Floch