The dimer of trifluoropyruvic acid was obtained starting from perfluoropropene-1,2-oxide in good yield by a simple and convenient procedure, and its structure was confirmed by X-ray diffraction.
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Crystal data of 5. C6H2F6O6, M = 284.08, triclinic, space group P-1, a = 562.53(11), b = 801.66(16), c = 1060.6(2) pm, α = 93.06(3), β = 98.09(3), γ = 99.39(3)°, V = 0.46576(16) nm3, T = −100 °C, Z = 2, μ = 0.247 mm−1, F(000) = 280, from 6490 reflections measured 1655 were independent (Rint =0.1120). R = 0.0630 (I > 2σ(I)), Rw = 0.1652 (F2, all data), 171 parameters, largest difference peak and hole 0.281/–0.289 e·Å−3, θmax = 25.94°, Mo-Kα radiation (λ = 71.073 pm). The structure was solved by direct methods and refined using the SHELX program system (Sheldrick, G. M. SHELX-97, University of Göttingen, 1997). Hydrogen atoms were refined isotropically. Crystallographic data have been deposited with the Cambridge Crystallographic Data Centre as supplementary publications, CCDC 217241. Copies of the data can be obtained on application to the director, CCDC; 12 Union Road, Cambridge CB2 1EZ, UK (E-mail: deposit@ccdc.cam.ac.uk).
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