Fluorenones (fluorine-9-ones) are among the oldest classes of bioactive compounds, which are widely used as antiviral [1] and anticancer agents and act as the key synthetic intermediates in many reactions. Also, fluorenones with a suitable functionality can be used as a fluorescent electrophilic reagent [2]. Recently, they have mainly been considered as an important unit in polymer chemistry. The fluorenone structural unit provides both rigidly planarized biphenyl units within the polymer backbone and the possibility of remote functionalization at C-9, the latter offer the prospect of improving both polymer processibility and mediating potential interchain interactions in films [3]. Owing to our growing interest in the synthesis of bioactive heterocycles [4], we became interested in examining the cyclization of diazotized compounds to new fluoreno [1,2- d]imidazol-10-ones. This research has demonstrated that the cyclization of diazotized oamino- ketones is a reliable work, which can be extended to the synthesis of other new heterocyclic compounds.

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