ˈɪləstɹətˌɪv ɪz ɐ ɹɪˈækʃən ðæt ɡˈɪv ɹˈaɪz tʊ ˈælkiːn pˌɑːlɪmɚɹaɪzˈeɪʃən kˈæɾɐlˌɪsts wˌɛɹ tɹˈɪs pˈɛntɐflˌʊɹɹəfˌiːnaɪl bˈoːɹɑːn ɪz jˈuːzd æz ɐn ˈæktᵻvˌeɪɾɚ ɔːɹ kˈɑːkɐtˌælɪst:
Illustrative is a reaction that give rise to alkene polymerization catalysts where tris(pentafluorophenyl)boron is used as an activator or cocatalyst: