Reactant or reagent for synthesis of:Vernonia allenes and sesquiterpenoidsMonohalovinylated pyrethoids with insecticidal activityVitamin D analogs with anticancer activityReactant for:Asymmetric substitution affecting optical properties of boradiazaindacene dyesCarbanionic rearrangements of halomethylenecyclobutanesUsed for diferrocenyl molecular wires