Bis-(β-diketones)

Methods of synthesis of various types (including those containing the ferrocene structure) of bis-(β-diketones) which are of interest as intermediates in organic synthesis, owing to their high reactivity, are described. The physical and chemical properties of these tetraketones, due to their structural features, to the presence of four carbonyl groups in the molecule, and to ketol–enol tautomerism are examined. 119 references.