[4-(Allyloxy)phenyl](phenyl)methanone

The structure of the title compound, C16H14O2, features a dihedral angle of 54.4 (3)° between the aromatic rings. The allyl group is rotated by 37.4 (4)° relative to the adjacent benzene ring. The crystal packing is characterized by numerous C—H⋯O and C—H⋯π interactions. Most of these interactions occur in layers along (011). The layers are linked by C—H⋯π interactions along [100], forming a three-dimensional network.

The structure of the title compound, C 16 H 14 O 2 , features a dihedral angle of 54.4 (3) between the aromatic rings. The allyl group is rotated by 37.4 (4) relative to the adjacent benzene ring. The crystal packing is characterized by numerous C-HÁ Á ÁO and C-HÁ Á Á interactions. Most of these interactions occur in layers along (011). The layers are linked by C-HÁ Á Á interactions along [100], forming a threedimensional network.

Introduction
The title compound C 16 H 14 O 2 , is based on a photoreactive benzophenone derivative that can be bound to SiO 2 surfaces via a silane anchor. This substrate is a compound that has a benzophenone moiety which exhibits a known photoreactivity and is particularly useful in photopolymerizable organopolysiloxane and silicone resins Prucker et al., (1999);Shirahata & Kishimoto, (1984); Dorman & Prestwich, (1994); Beckett & Porter, (1963). When triggered by UV light (λ = 365 nm), a biradical triplet state is formed, which is able of abstracting a proton from any neighboring aliphatic C-H group to form a C-C bond (Ferreira et al., (1995); Balakirev et al., (2005); Kubo et al. (2010)) and as a result of the photochemical reaction, a thin layer of the polymer is covalently bound to the surface (Prucker et al. (1999); Shirahata & Kishimoto, (1984); Dorman & Prestwich, (1994); Matsushita et al. (1992)). This molecule can be also copolymerized with other polymer molecules and will not migrate out through its double bond.

Refinement
All H atoms were placed in idealized positions, with C-H bond lengths fixed to 0.93 (aromatic C-H) or 0.97 Å (terminal methylene), and refined as riding with displacement parameters calculated as Uiso(H) = xUeq(carrier C) where x = 1.2.

Figure 1
The ORTEP structure of the title compound with displacement ellipsoid plot drawn at the 50% probability level.

Special details
Experimental. The absence of some reflections of the data sets is due to merged them. The 001 reflection was removed because it intensity was affect by the beam stop. Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq C16