Tracking reactive intermediates in phosphine-promoted reactions with ambiphilic phosphino-boranes

摘要

The ambiphilic phosphino-borane i-Pr_2P(o-C_6H_4)BMes_2 affords stable versions of key zwitterionic intermediates by reactions with diethyl azodicarboxylate or PhNCO.rnOver the past 20 years, derivatives combining donor and acceptor functionalities, so-called ambiphilic compounds, have attracted increasing interest. In particular, combinations of phosphine and borane moieties have been studied as π-conjugated materials, as metal-free systems capable of dihydrogen activation and transfer, and as versatile ligands for transition metals.