Michael A. Beswick, Alexander D. Hopkins, Lesley C. Kerr, Marta E. G. Mosquera, Julie S. Palmer, Paul R. Raithby, Alexander Rothenberger, Andrew E. H. Wheatley, Dominic S. Wright, D. Stalke and Alexander Steiner
Reduction of [ButP]4 with K metal (1:5 equiv.) followed by the addition of pmdeta and stoichiometric hydrolysis gives [{(ButP)2H}K·pmdeta]2, a unique complex containing a [ButP(H)PBut]– anion ligand homologous with a phosphido anion (R2P–).