trans-1,2,3-Tris(4-methoxybenzoyl)cyclopropane

In the title compound, C27H24O6, the packing of the molecules is mainly governed by C—H⋯O interactions.

In the title compound, C 27 H 24 O 6 , the packing of the molecules is mainly governed by C-HÁ Á ÁO interactions.

trans-1,2,3-Tris(4-methoxybenzoyl)cyclopropane
Jingjing Sun and Nengfang She S1. Comment The unusual bonding of cyclopropanes and the strain release associated with cleavage of cyclopropanes offer the possibility of recognizing that structural unit when it is a part of a larger molecule. We report here the molecular structure of the title cyclopropane derivative (Fig. 1), which is an important intermediate in organic synthesis (Saba, 1990). Since numerous methodologies have been developed for the construction of three-membered carbocycles, the chemistry of cyclopropanes has emerged as a versatile tool in organic synthesis (Wong, 1989).
The crystal packing is stabilized by intermolecular C-H···O interaction.

S2. Experimental
The title compound was synthesized according to the procedure reported (Saba, 1990). Crystals appropriate for X-ray data collection were obtained by slow evaporation of the dichloromethane solution at 293 K.

S3. Refinement
All H atoms were positioned in geometrically idealized positions and constrained to ride on their parent atoms, with C-H distances in the range 0.93-0.98 Å with U iso (H) = 1.2U eq (C) or U iso (H) = 1.5U eq (C).  The molecular structure of the title compound with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. H atoms are presented as a small spheres of arbitrary radius.

trans-1,2,3-Tris(4-methoxybenzoyl)cyclopropane
Special details Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness 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 threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) 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.