Abstract
Abstract The two-electron oxidation of 1,5-diselenacyclooctane (1) or 1,5-ditelluracyclooctane (3) with 2 equiv of NOBF4 gave the diselenide dication salt, 1,5-diselenoniabicyclo[3.3.0]octane bis(tetrafluoroborate) (2), or the ditelluride dication salt 4. The structures of the dications were characterized by 77Se and 125Te NMR spectroscopy and X-ray crystallographic analysis. The diselenide dication salt 6 having aromatic ring was formed in the reaction of 5H,7H-dibenzo[b,g][1,5]diselenocin 6-oxide (5) with 2 equiv of silylating reagent, CF3SO3SiMe3. These dications react either as an oxidant or as an electrophile depending on the added reagent.
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