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The reaction of¯avanone with Cr(CO) 6 gives two diastereomeric complexes 1 (cis) and 2 (trans) with the general formula [Cr(CO) 3 (C 15 H 12 O 2 )]. Due to the existence of an asymmetric carbon atom in the -pyrone ring, the two isomers are chiral. Both complexes were characterized by elemental microanalysis as well as by IR, NMR, UV, and mass spectroscopy. The X-ray analysis of 1 has shown that the Cr(CO) 3 tripod is complexed to the benzene ring in an eclipsed conformation. The phenyl group adopts a cis con®guration with respect to the tricarbonylchromium moiety, and the -pyrone ring is oriented in a 1,2-diplanar conformation.

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