Date Published: April 01, 2011
Publisher: International Union of Crystallography
Author(s): Mukut Gohain, Theunis J. Muller, Barend C. B. Bezuidenhoudt.
In the title compound, [Cr(C16H16O2)(CO)3], the Cr0 atom of the Cr(CO)3 unit is coordinated to the phenyl ring of the flavan ligand in an η6 mode, with a normal arene-to-metal distance. The Cr(CO)3 unit exhibits a three-legged piano-stool conformation, while the dihydropyran ring displays a distorted envelope configuration. The phenyl ring is twisted away from the fused ring system by 25.5 (2)°. The methoxy group is almost coplanar with the phenyl ring [CMe—O—Car—Car torsion angle = 8.46 (2)°]. The crystal packing is stabilized by intermolecular C—H⋯O interactions.
For similar structures, see: van Tonder et al. (2010a ▶,b ▶) and for other related structures, see: van Tonder et al. (2009a ▶,b ▶). For the synthesis of the title compound, see: Müller et al. (1999 ▶) and for the sythesis of 7-methoxyflavan-4-one, see: Sato et al. (2006 ▶). For standard bond lengths, see: Allen et al. (1987 ▶). For the importance of flavonoids in biological investigations, see: Rice-Evans & Packer (2003 ▶). For the use of tricarbonyl(arene)chromium complexes in regioselective organic synthesis, see: Muschalek et al. (2007 ▶).