1: diphenylene oxide With n-butyllithium in tetrahydrofuran; hexane T=20°C; 2 h; 2: triphenyl-silyl chloride in tetrahydrofuran; diethyl ether; hexane T=20°C;

n-butyllithium; diethyl ether anschliessend Behandeln mit Chlor-triphenyl-silan in Aether;