CuBr2Li in tetrahydrofuran T=-60°C;

magnesium bromide in diethyl ether T=0°C; 1 h; Yield given;

1: (S)-1-ethyl-2-(p-tolylsulfinyl)benzene With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78 - 0°C; Cooling; 2: With copper (I) cyanide; lithium chloride in tetrahydrofuran; hexane T=-78°C; 0.0833333 h; Cooling; 3: 4-phenylbut-3-yn-2-yl methanesulfonate in tetrahydrofuran; hexane T=-78°C; 0.0833333 h; optical yield given as percent de;