Organolithium compounds, especially n-butyllithium, are useful reagents in organic synthesis, as might be expected given lithium's diagonal relationship with magnesium, which plays an important role in the Grignard reaction.
ɔːɹɡˌænoʊlˈɪθiəm kˈɑːmpaʊndz, ɪspˈɛʃəli ˈɛnbjˌuːɾɪlˈɪθiəm, ɑːɹ jˈuːsfəl ɹɪˈeɪdʒənts ɪn ɔːɹɡˈænɪk sˈɪnθəsˌɪs, æz mˌaɪt biː ɛkspˈɛktᵻd ɡˈɪvən lˈɪθiəmz daɪˈæɡənəl ɹᵻlˈeɪʃənʃˌɪp wɪð mæɡnˈiːziəm, wˌɪtʃ plˈeɪz ɐn ɪmpˈoːɹtənt ɹˈoʊl ɪnðə ɡɹˈɪɡnɑːɹd ɹɪˈækʃən.