3,3,3-Trifluoro-2-hydr-oxy-2-(trifluoro-meth-yl)propionic acid.

ABSTRACT

In the title perfluorinated hy-droxy-isobutyric acid derivative, C4H2F6O3, the mol-ecule shows approximately Cs symmetry. The carb-oxy group is nearly coplanar with the C-OH moiety and the O=C-C-O(H) torsion angle is 5.5 (2)°. An intra-molecular O-H⋯O hydrogen bond occurs. In the crystal, O-H⋯O hydrogen bonds connect the mol-ecules into supra-molecular chains along the a-axis direction.