Acta Cryst. (2010). E66, m907-m908  [ doi:10.1107/S1600536810024992 ]

Racemic tricarbonyl(⁶-7-methoxyflavan)chromium(0)

J. H. van Tonder, B. C. B. Bezuidenhoudt and J. M. Janse van Rensburg

Abstract: In the title compound [systematic name: tricarbonyl(⁶-7-methoxy-2-phenyl-3,4-dihydro-2H-1-benzopyran)chromium(0)], [Cr(C₁₆H₁₆O₂)(CO)₃], the Cr(CO)₃ unit is coordinated by the phenylene ring of the flavan ligand, exhibiting a three-legged piano-stool conformation, with a point to plane distance of 1.750 (1) Å. The phenyl ring is twisted away from the fused ring system by 36.49 (5)° (r.m.s. deviation = 0.027 Å; fitted atoms are the C₆ ring and the attached fused-ring C and O atoms). The dihydropyran ring displays a distorted envelope configuration by displacement of the phenyl-bearing and the adjacent ring C atoms from the fused-ring system plane by 0.356 (2) and 0.402 (2) Å, respectively.

Online 10 July 2010

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