Carbene-complex-promoted ring expansion of aziridine: formation of the 1-azabicyclo[4.3.0] ring system by a double alkyne and a single carbon monoxide insertion reaction

Abstract
A chromium carbene complex (2) bearing a 2-methylaziridine ring system on the carbene carbon atom easily undergoes a double diphenylacetylene and a single CO insertion reaction to give a 1-oxotetrahydroindolizine derivative (4), which has been fully characterized by X-ray analysis of its Cr(CO)3 adduct (3).

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