Synthesis and crystal structure of N,N,N′,N″,N″-pentamethyldiethyl-enetriamine co-coordinated potassium bis(diphenylphosphanyl)amide Synthese und kristallstruktur von N,N,N′,N″,N″-pentamethyl-diethylentriamin-cokoordiniertem kalium-bis(diphenylphosphanyl)amid - Heinemann, Frank Wilhelm; et al. (Chemische Berichte, 1997)