In solution, triketones I represent a mixture of four enolic forms [2]. Two of these forms contain both a carbonyl-conjugated l'-hydroxyethylidene group and the 2-ene-l, 4-dione fragment, which makes them structurally similar to cyclopentane-based antitumor antibiotics such as pentenomycins [3, 4](including sarcomycin [5] used in clinical practice), as well as clavulones, chloro (boromo, iodo) valones, and pimaglandins [6, 7]. As is known, 2-alkyl ( ...