1: 2-chloro-4-phenyl-1-buten-3-yne With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78 - -30°C; 1 h; 2: With zinc dibromide in tetrahydrofuran; hexane T=-30 - 0°C; 0.5 h; 3: benzyl bromide With [Pd{bis[2-(diphenylphosphino)phenyl] ether}Cl2] in tetrahydrofuran; hexane T=23°C; 3 h;

(i) EtMgBr, THF, (ii) /BRN= 2217278/; Multistep reaction;