Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Facile and efficient preparation of the unknown primary β-enaminophosphines. Synthesis of the first 1,3,4-diaza-λ 5 -phosphinines. ... N-Arylphospha-λ 5 -azenes (1) and (3) were reduced with LiAlH 4 to phosphine derivatives. The addition of ethyl azidoformate to β- ...