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The activation of C3O2 by the U(iii) complex [U(η5-Cp')3] (Cp' = C5H4SiMe3) is described. The reaction results in the reductive coupling of three C3O2 units to form a tetranuclear complex with a central cyclobutane-1,3-dione ring, with concomitant loss of CO. Careful control of reaction conditions has allowed the trapping of an intermediate, a dimeric bridging ketene complex, which undergoes insertion of C3O2 to form the final product.

Activation of carbon suboxide (C3O2) by U(iii) to form a cyclobutane-1,3-dione ring

Activation of carbon suboxide (C₃O₂) by U(iii) to form a cyclobutane-1,3-dione ring