text: Methylcyclopentadiene is any of three isomeric cyclic dialkenes with the formula CMeH (Me = CH). These isomers are the organic precursor to the methylcyclopentadienyl ligand (CHMe, often denoted as Cp′), commonly found in organometallic chemistry.
  As with cyclopentadiene, methylcyclopentadiene is prepared by thermal cracking of its Diels–Alder dimer, followed by distillation for removal of cyclopentadiene, a common impurity.