2,4,5-Triphenyl-1-(prop-2-en-1-yl)-1H-imidazole

In the title compound, C24H20N2, one of the ring C atoms and one of the ring N atoms are disordered over two sets of sites in a 0.615 (3):0.385 (3) ratio. The two parts of the disordered imidazole ring adopt an envelope conformation, with the undisordered ring N atom as the flap, displaced by −0.118 (6) and 0.226 (7) Å, respectively, in the two disorder components from the plane through the other ring atoms. The crystal structure features C—H⋯N hydrogen bonds and C—H⋯π interactions, which lead to the formation of infinite chains along [010].

In the title compound, C 24 H 20 N 2 , one of the ring C atoms and one of the ring N atoms are disordered over two sets of sites in a 0.615 (3):0.385 (3) ratio. The two parts of the disordered imidazole ring adopt an envelope conformation, with the undisordered ring N atom as the flap, displaced by À0.118 (6) and 0.226 (7) Å , respectively, in the two disorder components from the plane through the other ring atoms. The crystal structure features C-HÁ Á ÁN hydrogen bonds and C-HÁ Á Á interactions, which lead to the formation of infinite chains along [010].
In the crystal structure, molecules are linked by intermolecular C-H···N hydrogen bonds (Table 1, Fig. 2). In addition, C-H···π interactions contribute to the stabilization of the crystal packing.

Experimental
The title compound was synthesized according to our reported method (Mohamed et al. 2013a) in 83% yield. Colourless plates suitable for X-ray analyses were obtained by slow evaporation of a solution of (I) in ethanol, m.p. 377-379 K.

Refinement
All H atoms were placed in geometrically, with C-H = 0.95 and 0.99 Å, and refined as riding with U iso (H) = 1.2 U eq (C) of the parent atom. The carbon (C2) and nitrogen (N2) atoms which are adjacent at the imidazole ring and the phenyl (C16-C21) and propane (C22-C24) groups which attached to them respectively, are disordered over two sites (with the suffixes A and B) with an occupancy ratio of 0.615 (3):0.385 (3). The atoms of the disordered propane groups were set to equal each other by an EADP instruction. The disordered phenyl ring (C16B-C21B) was constrained to a rigid hexagon with the AFIX 66 instruction, and for the other atoms of disorder the SIMU and DELU instructions were used in the refinement procedure.

Computing details
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).  The packing diagram of the title compound viewing along the b axis. The hydrogen atoms not involved in hydrogen bonding and the minor component of the disorder have been omitted for clarity. where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.49 e Å −3 Δρ min = −0.29 e Å −3 Special details Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles Refinement. Refinement on F 2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The observed criterion of F 2 > σ(F 2 ) is used only for calculating -R-factor-obs etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq Occ. (