A series of [3+2] cycloaddition products from the reaction of rhenium oxo complexes with diphenyl ketene

摘要

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)(2)Re(Cl)O-3] (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 OReO motif across the ketene CC 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 C-13 NMR and IR spectroscopies.