ɔːltˈɜːnətˌɪvli, kəmˈɜːʃəl mˌɛθəlˈɪθiəm kæn biː tɹˈiːɾᵻd wɪð daɪˈɑːkseɪn tə pɹɪsˈɪpᵻtˌeɪt lˈaɪ bˌiːˈɑːɹ daɪˈɑːkseɪn, wˌɪtʃ kæn biː ɹᵻmˈuːvd baɪ fɪltɹˈeɪʃən.
Alternatively, commercial methyllithium can be treated with dioxane to precipitate LiBr(dioxane), which can be removed by filtration.