Palangpon KongsaereeSuthad TanboriphanBongkoch TarnchompooYodhathai ThebtaranonthMahidol UniversityThailand National Center for Genetic Engineering and Biotechnology2018-09-072018-09-071999-12-15Acta Crystallographica Section C: Crystal Structure Communications. Vol.55, No.12 (1999), 2007-2010010827012-s2.0-0347333623https://repository.li.mahidol.ac.th/handle/20.500.14594/25322Treatment of dimethyl 1,3-butadiene-2,3-dicarboxylate with Fe2(CO)9provided the corresponding tricarbonyl(η4-dimethyl 1,3-butadiene-2,3-dicarboxylatoO)iron, [Fe(C8H10O4)(CO)3], (II), as the main product and the novel μ-[(1,2-η,κO3:3,4-η,κO2)-dimethyl 1,3-butadiene-2,3-dicarboxylato]bis(tricarbonyliron), [Fe2-(C8H10O4)(CO)6], (III). In the crystal structure of (II), the electron-deficient butadiene complexes with one Fe(CO)3group, whereas in (III), the butadiene adopts an unusual conformation and forms a complex with two Fe(CO)3groups. In (III), each Fe atom possesses a trigonal bipyramidal geometry, with one olefinic bond and two carbonyl ligands occupying the basal positions, and the keto oxygen of the ester and the other carbonyl ligand occupying apical positions.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.1107/S0108270199011695