ɪt hˈæzbiːn ɹˈiːsəntli ʃˈoʊn ðætðə lˈoʊ sᵻlɪktˈɪvᵻɾi ʌv ðɪs mˈɛθəd ɪz dˈuː tə ðə ʃˈeɪp ʌvðə tɹænsˈɪʃən stˈeɪt.
It has been recently shown that the low selectivity of this method is due to the shape of the transition state.