Dimethyl (2-hydroxy-4-phenylbut-3-en-2-yl)phosphonate

In the title compound, C12H17O4P, the phenylbutenyl group is disordered over two sets of sites with an occupancy ratio of 0.755 (12):0.245 (12). In the crystal, inversion dimers linked by pairs of O—H⋯O hydrogen bonds occur, forming R 2 2(10) ring motifs. The packing is consolidated by weak C—H⋯π interactions.

In the title compound, C 12 H 17 O 4 P, the phenylbutenyl group is disordered over two sets of sites with an occupancy ratio of 0.755 (12):0.245 (12). In the crystal, inversion dimers linked by pairs of O-HÁ Á ÁO hydrogen bonds occur, forming R 2 2 (10) ring motifs. The packing is consolidated by weak C-HÁ Á Á interactions. Mo K radiation = 0.21 mm À1 T = 296 K 0.25 Â 0.14 Â 0.12 mm
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5172).
In the crystal structure of title compound phenylbutan is disordered over two possible sites with occupancy ratio of 0.755 (12) (10) ring motif (Bernstein et al., 1995). The molecules are stabilized due to C-H···π interactions (Table 1).
The mixture was cooled to 273 K and in it KF (1.74 g, 30 mmol) and γ-Al 2 O 3 (1.74 g, 17 mmol) were added and refluxed.
The precipitates obtained after 48 h were washed with hot distiled water (50 ml) and dried. The crude material was dissolved in distiled water with few drops of ethyl alcohol and colourless needles of (I) were obtained after 4 days.
The incorrect bond distances and higher thermal parameters of phenylbutan lead to disorder. In the disordered group the benzene rings were refined using AFIX 66. The benzene ring B (C2B-C6B) was refined using EADP. Fig. 1. View of (I) with the atom numbering scheme for atoms of greater occupancy ratio. The displacement ellipsoids are drawn at the 30% probability level. H-atoms are shown by small circles of arbitrary radii. Fig. 2. View of the title compound with the atom numbering scheme for atoms of smaller occupancy ratio. The displacement ellipsoids are drawn at the 30% probability level. H-atoms are shown by small circles of arbitrary radii. Fig. 3. The partial packing of (I), which shows that molecules form inversion dimers.