ɪts lˈuːɪs ˈæsɪd stɹˈɛŋθ, æz kwˈɔntᵻfˌaɪd baɪ ɛkspˌɛɹɪmˈɛntəl ˌiːkwɪlˈɪbɹiəm kˈɑːnstənts, ɪz baɪ sˈɛvən ˈɔːɹdɚz ʌv mˈæɡnɪtˌuːd hˈaɪɚ ðɐn ðə wˈʌn ʌv stɹˈʌktʃɚɹəli ɐnˈæləɡəs tɹˈɪfˌiːnaɪlbˌoːɹeɪn.
Its Lewis acid strength, as quantified by experimental equilibrium constants, is by 7 orders of magnitude higher than the one of structurally analogous triphenylborane.