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Updated: Sep 14, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Reversible CO Insertion into the Si = Si Double Bond Enables a Disila-Bislactone Formation via Subsequent CO2
Fiona J Kiefer1, Arseni Kostenko1, Richard Holzner1
1TUM School of Natural Sciences, Department of Chemistry, Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching bei München 85748, Germany.
None:
Carbon monoxide inserts into the Si═Si double bond of an imino(silyl)disilene and tetra(silyl)disilene affording the corresponding 1,3-disilaallene oxides, characterized by NMR spectroscopy and X-ray crystallography and supported by quantum chemical calculations. In the case of imino(silyl)disilene, the CO insertion is less exergonic than for tetrasilyldisilene and, thus, is fully reversible in the presence of a CO trapping agent. The reaction mechanisms and reversibility facilitated by the imino-substituent were supported by quantum chemical calculations. The imino-supported 1,3-disilaallene oxide can react with low-pressure CO2 to a disila-2,4-furandione; with increased CO2 pressure, a 6-membered ring, disila-bislactone is formed. Their formation mechanisms were investigated via DFT calculations. Reaction of CO2 with 1,3-disilaallene oxide was compared to the imino(silyl)disilene reacting with CO2 in a [2 + 2] cycloaddition.
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