This organometallic compound, consisting of chloromercury-substituted cyclopentadiene and iron(II), is primarily utilized in organic synthesis and catalysis, particularly in reactions involving cyclopentadiene and iron complexes. It serves as a catalyst or intermediate in processes such as cycloaddition reactions, facilitating the efficient construction of cyclic and ferrocene-based structures. Additionally, it finds application in the preparation of advanced organometallic compounds, which are valuable in materials science and pharmaceutical research. Its unique structure enables specific transformations that are challenging with other catalysts, making it a useful tool in advanced chemical synthesis. Due to the presence of mercury, it must be handled with caution owing to its toxicity.