J. Barluenga et al., UNEXPECTED AND EASY ANNULATION OF FISCHER-TYPE PHENYLETHENYL CARBENE COMPLEXES, Journal of the Chemical Society, Chemical Communications, (19), 1995, pp. 1973-1974
The reaction between 2-aminobuta-1,3-dienes and Fischer-type phenylace
tylenic carbene complexes leads under very mild conditions to highly f
unctionalized dihydrofluorene derivatives in almost quantitative yield
s via annulation of a phenylethenyl carbene intermediate.