Collect. Czech. Chem. Commun. 1997, 62, 479-493

On the Synthesis of 2-Substituted (η6-Indan-1,3-dione)tricarbonylchromium Complexes

Peter Hrnčiar, Pavel Hrnčiar, Vladimír Gajda, Eva Švanygová and Štefan Toma

Department of Organic Chemistry, Comenius University, 842 15 Bratislava, Slovak Republic


Classical methods for the synthesis of indan-1,3-dione derivatives failed when applied to their tricarbonylchromium complexes. The desired 2-substituted (η6-indan-1,3-dione)tricarbonylchromium complexes were prepared starting from protected indan-1,3-dione derivatives such as bis(dioxolanes) and enol ethers. Tricarbonylchromium complexes of indan-1,3-dione having at least one hydrogen at C-2 are unstable. Nevertheless, ethylation of 2-methyl(η6-indan-1,3-dione)tricarbonylchromium and methylation of 2-ethyl(η6-indan-1,3-dione)tricarbonylchromium were possible and proceeded with high stereoselectivity.

Keywords: Indan-1,3-dione; Tricarbonylchromium complexes.