The reaction of N -alkyltrifluoroacetimidoyl chlorides with trialkyl phosphites leads to corresponding imidoylphosphonates CF3C[P(O)(OAlk)2]=NCH2R. These compounds undergo irreversible 1,3-H shift catalyzed by nitrogenous bases to give phosphorylated imines CF3CH[P(O)(OAlk)2]N=CHR. The tendency for prototropism increases with increasing electronegativity of substituents R: CF3 > CH2OMe > H > Me. N
的反应 Ñ -alkyltrifluorOAcetimidoyl
氯化物与三烷基
亚磷酸酯通向相应imidoylphosphonates CF 3 C [P(O)(OAlk)2 ] = NCH 2 R.这些化合物经历由含氮碱基催化不可逆的1,3--H移位,得到
磷酸化的
亚胺CF 3 CH [P(O)(OAlk)2 ] N = CHR。随着取代基R:CF 3 > CH 2 OMe> H> Me的电负性的增加,原质性的趋势增加。 所获得的化合物的 N- 环戊基类似物没有显示出质变倾向。
酰亚胺基
膦酸酯主要以 Z 异构体的形式存在[ Z / E〜 (6-10):1]。