title: A series of [3 + 2] cycloaddition products from the reaction of rhenium oxo complexes with diphenyl ketene.
abstract: The reaction of rhenium (VII) trioxo complexes containing the ligand sets scorpionate, [HB(pz)3]ReO3 (6), [Ph-B(pz)3]ReO3 (7), and [[HC(pz)3]ReO3][ReO4] (8) and pyridine/pyridine-type ligands [(4,7-diphenyl-1,10-phen)(Br)ReO3] (12), [(4,4'-di-tert-butyl-2,2'-dipyridyl)(Cl)ReO3] (13), and [(py)2Re(Cl)O3] (4), with diphenyl ketene, has led to the isolation of six novel [3 + 2] cycloaddition products. These air-stable solids 9-11 and 15-17 are the result of [3 + 2] addition of the O=Re=O motif across the ketene C=C double bond. Five of the six [3 + 2] cycloaddition products have been structurally characterized by single-crystal X-ray diffraction and in all cases by 13C NMR and IR spectroscopies.
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K.
authors.forename: Michael
authors.initials: M
authors.lastname: Middleditch
authors.forename: James C
authors.initials: JC
authors.lastname: Anderson
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.forename: Clare
authors.initials: C
authors.lastname: Wilson