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A novel metal-free synthesis of indenone derivatives mediated by CBr 4  and diethyl phosphonate is reported. The methodology has a relatively wide substrate scope and is suitable to access a π-extended indenone and an  s -indacene-1,5-dione derivative as well.

Metal-free synthesis of indenone derivatives from ortho -alkynylaryl ketones mediated by the combination of dialkyl phosphonates and CBr 4