The most important of these compounds is sodium cyclopentadienide, NaC5H5, an important precursor to many transition metal cyclopentadienyl derivatives.
ðə mˈoʊst ɪmpˈoːɹtənt ʌv ðiːz kˈɑːmpaʊndz ɪz sˈoʊdiəm sˈaɪkloʊpˌɛnteɪdˌiənaɪd, nˈɑː sˈiː fˈaɪv ˈeɪtʃ fˈaɪv, ɐn ɪmpˈoːɹtənt pɹɪkˈɜːsɚ tə mˈɛni tɹænsˈɪʃən mˈɛɾəl sˈaɪkloʊpˌɛnteɪdˌiənaɪl dᵻɹˈɪvətˌɪvz.