text: Alkylation of beryllium halide is another common method to react to make an organoberyllium compound such as this:
  M is not limited to any main group and/or transition metal.  is not limited to phenyl, methyl, methyl oxide, carbene etc.  can be any halide such as fluoride, bromide, iodide, or chloride.
  An example of such reaction is the synthesis of bis(cyclopentadienyl)beryllium () or beryllocene from  and potassium cyclopentadienide: