Triphen-yl[(4-phenyl-benzo-yl)meth-yl]phospho-nium trifluoro-methane-sulfonate.

In the cation of the title compound, C(32)H(26)OP(+)·CF(3)O(3)S(-), the dihedral angle between the benzene rings of the biphenyl group is 42.37 (8)°. In the crystal, the cations and anions inter-act through inter-molecular C-H⋯O hydrogen bonds, forming chains parallel to the b axis. These chains are further linked by C-H⋯π stacking inter-actions into layers parallel to the bc plane.

In the cation of the title compound, C 32 H 26 OP + ÁCF 3 O 3 S À , the dihedral angle between the benzene rings of the biphenyl group is 42.37 (8) . In the crystal, the cations and anions interact through intermolecular C-HÁ Á ÁO hydrogen bonds, forming chains parallel to the b axis. These chains are further linked by C-HÁ Á Á stacking interactions into layers parallel to the bc plane.

Comment
The synthesis of α-ketostabilized phosphorus ylides has attracted much interest over the last decades due to their stability and ability to act as bifunctional ligands (C-versus O-coordination;Kalyanasundari et al., 1995;Kalyanasundari et al., 1999;Laavanya et al., 2001;Vicente et al., 1985). In this respect, the preferred coordination modes of 4-flourobenzyloxymethylenetriphenylphosphorane ylide (FBPPY), 4-chlorobenzyl-oxymethylenetriphenylphosphorane ylide (CBPPY), and 4-methoxybenzoylmethylenetriphenylphosphorane ylide (MOBPPY) to transition metals such as mercury (II), silver (I) and palladium (II) have been recently investigated by our group (Karami, 2007(Karami, , 2008Akkurt et al., 2008). As a part of our ongoing study on the synthesis and characterization of new trifluoromethanesulfonate phosphonium ylides, the title compound has been prepared according to the sequence shown in Figure 3 (Burmeister et al., 1973), and its crystal structure is reported herein.
In the title compound ( Fig. 1 Table 1). The chains further interact through C-H···π stacking interactions to form layers parallel to the bc plane (see Fig. 2 & Table 1).

Experimental
The title compound was obtained by reaction of (4-phenylbenzoylmethyl)triphenylphosphonium bromide and AgOTf (OTf : trifluoromethanesulfonate) in dry acetone in a 1:1 molar ratio under stirring for 12 h (Fig. 3). The precipitate obtained was washed several times with dry diethyl ether and dried in a vacuum. Orange crystals of the title compound suitable for X-ray analysis formed by addition of dry diethyl ether to a chloroform solution. The crystals are air stable and resistant against moisture.

Refinement
All H atoms were placed in calculated positions and treated as riding on their parent atoms, with C-H = 0.93-0.97 Å, and with U iso (H) = 1.2 U eq (C).