in tetrahydrofuran immediate react. in THF at room temp.; solvent removed; 1-phenyl-2,3,4,5-tetramethylphosphole extd. with hexane and purified by chromy. (alumina);

1: diphenyl acetylene With 4-(N,N-dimethlyamino)pyridine; n-butyllithium; zirconocene dichloride in tetrahydrofuran; hexane T=0°C; Addition; 1.5 h; 2: 2-Butyne in tetrahydrofuran; hexane T=25°C; cross-coupling; 2 h; 3: phenylphosphonous dichloride in tetrahydrofuran; hexane T=25°C; Substitution; 16 h;

n-butyllithium; zirconocene dichloride 1) THF, -78 deg C; 2) THF, RT; Yield given. Multistep reaction;