1 l-Tungstovanado(IV)phosphate Anion pentaborane(9), it was hoped that, in addition to obtaining a /BB value for l-CH(Br)(CH3)BsH8, dehydrohalogenation of this product would be a successful route to the unknown species l-vinylpentaborane(9). Instead, the product has been determined to be 2-bromo-l-ethylpentaborane(9) by infrared and mass spectral analysis and nB nmr spectra. This product would be expected from a free-radical bromination if halogenation of the basal position on B5H9 proceeds by a free-radical mechanism as proposed previously.37

Das Anion PVIVW, 1025′ wird durch elektrolytische Reduktion des entsprechenden VV‐Komplexes oder durch Reaktion von VO2+ mit PWIIO ; bei pH 4,5 erhalten.