Ketene chemistry metal carbene complexes

W. D. Wulff, Transition Metal Carbene Complexes Alkyne and Vinyl Ketene Chemistry, in Comprehensive Organometallic Chemistry II, Vol. 12, L. S. Hegedus, Ed., Pergamon, Tarrytown, NY, 1995, Chapter 5.3, pp. 469/. 

Hegedus et al. discovered that irradiation of chromium-carbene complexes resulted in a photoinsertion of CO into the Cr-carbene bond to form Cr-ketene complexes [96, 97]. This opened novel routes to the preparation of valuable compounds via Cr-ketene chemistry. Among them, the reaction of metallated ketenes with imines was intensively explored [98-100]. Within this context, the reaction between several model Cr-ketenes (120) and imines was explored at the B3LYP/6-31G ECP level of theory [101, 102], The mechanisms thus obtained are reported in Scheme 31. 

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