1: phenylacetylene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; Inert atmosphere; 2: With sulfur in tetrahydrofuran; hexane T=-78 - 0°C; Inert atmosphere; 3: isopropyl bromide Further stages;

(i) Na, toluene, (ii) /BRN= 606222/, DMF; Multistep reaction;