1: diphenylene oxide With N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium in diethyl ether; n-heptane T=-78 - 20°C; 2: chloro-diphenylphosphine in diethyl ether; n-heptane T=-78 - 20°C;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine 1.a.) n-hexane, room temperature, b.) reflux, 1 h, 2.a.) n-hexane, 0 deg C, b.) 12 h, room temperature; Yield given. Multistep reaction. Yields of byproduct given;