1-Imidoalkylphosphonium salts with modulated C<sub>α</sub>–P<sup>+</sup> bond strength: synthesis and application as new active α-imidoalkylating agents
imidoalkylating properties of the obtained 1-imidoalkylphosphonium salts were tested using the Tscherniac-Einhorn-type reaction with aromatic hydrocarbons as a model reaction. It was found that the Cα-P+ bond strength can be considerably reduced and the imidoalkylation of arenes can be markedly facilitated using 1-imidoalkylphosphonium salts derived from triarylphosphines with electron-withdrawing substituents