amine is reduced (8.0 to 0.2 mol dm(-3)). Apparently the phenyl and sulfonate groups in the substrate become transposed, giving a phosphonamidic-sulfonic anhydride RP(O)(NHPh)OSO2Bn which then reacts at the phosphorus or sulfur atom to give the final products; an authentic sample of the anhydride gives similar mixtures of products. Substrate labelled with 18O in the sulfonyl position (57 mol% one 18O
R(Ph)P(O)N HOSO2Bn(R = PhMeCH)与Bu(t)NH2在
CH2Cl2中的反应生成RP(O)(NHPh)-NHBu(t)和Bu(t)NHSO2Bn的混合物随着胺浓度的降低(8.0到0.2 mol dm(-3)),磺酰胺的稳定添加量(从14.6%到32.9%)稳定增加。显然,底物中的苯基和
磺酸酯基发生了转位,生成了膦酰胺
磺酸酐RP(O)(NHPh)OSO2Bn,然后在
磷或
硫原子上反应生成最终产物;真实的酸酐样品得到类似的产物混合物。在磺酰基位置用18O标记的底物(57摩尔%1个18O原子)产生的磺酰胺含有大部分但不是全部标记(43.7摩尔%1个18O原子与2.0 mol dm(-3)胺)。这意味着在重排过程中三个
磺酸盐氧原子的部分平衡,