lˈɑːɹdʒɚ kwˈɔntᵻɾiz hɐvbɪn pɹɪpˈɛɹd baɪ ðə ɹɪˈækʃən ʌv ˈoʊzoʊn wɪð ɔːɹɡˈænɪk ɹᵻdˈuːsɪŋ ˈeɪdʒənts æt lˈoʊ tˈɛmpɹɪtʃɚz ɪn ɐ vɚɹˈaɪəɾi ʌv ɔːɹɡˈænɪk sˈɑːlvənts, sˈʌtʃ ɐz ðɪ ˈænθɹɐkwˌɪnɑːn pɹˈɑːsɛs.
Larger quantities have been prepared by the reaction of ozone with organic reducing agents at low temperatures in a variety of organic solvents, such as the anthraquinone process.