Four synthetic equivalents of (iPr2N)2P-OCH2CH2CN (1) have been prepared from readily available enantiomerically pure β-hydroxynitriles as well as from chiralβ-hydroxy esters. To demonstrate their possible use as phosphinating/resolving agents, these phosphorodiamidites have been used in the synthesis of known phosphoric acids. The method allows enantiomerically pure acids to be obtained through separation