Abstract
(CF3)3B · NH3 (1) has been oxidized in aqueous solution using a platinum anode. At pH = 8–9 in CsOH/Cs2CO3 solution Cs[(CF3)3B–NO2] (2), Cs2[(CF3)3B–N(O)=N(O)–B(CF3)3] (3) and Cs2[(CF3)3B–N=N(O)–B(CF3)3] (4) are formed. Compound 3 slowly hydrolyses to yield the hydroxyborate Cs[(CF3)3B–OH] (5). Compound 2 and traces of 3 and 5 were also formed by oxidation of 1 or (CF3)3B · NHEt2 with ozone. The constitution of the novel borates has been deduced from multinuclear NMR, IR and mass spectra. The structures of 2–5 have been investigated by single-crystal X-ray diffraction.
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