1: 1-benzyloxy-4-bromo-2-isopropylbenzene With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; hexane T=-78°C; 2 h; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-78°C; 1 h; 3: With water; ammonium chloride in tetrahydrofuran; hexane