Bis(diphenylphosphino)amin; die Darstellung aus 1.2.4.5-Tetrabrom-benzol und Natriumdiphenylphosphid in flüssigem Ammoniak und die Reaktion mit Chromhexacarbonyl / Bis(diphenylphosphino)amine; the Preparation from 1,2,4,5-Tetrabromo-benzene and Sodium-diphenyl-phosphide in Liquid Ammonia and the Reaction with Chromiumhexacarbonyl

1,2,4,5-Tetrabromo-benzene and NaP(C₆H₅)₂ (molar ratio 1 : 4) reacts in liquid ammonia under deposition of 4 moles NaBr. But instead of the expected compound 1,2,4,5-tetrakis (diphenylphosph ino) benzene, bis (diphenylphosphino)amine was formed. [(C₆H₅)₂P]₂NH was characterized by mass-, IR- and ¹H-NMR-spectra and also by the reaction with chromiumhexacarbonyl.