1: With chromium(VI) oxide; sulfuric acid in water T=5 - 15°C; 0.25 h; 2: (2-methoxy-5-trifluoromethylphenyl)-phenylmethanol in water; acetone T=20 - 25°C; 1.23333 h; 3: With sodium hydrogencarbonate; isopropyl alcohol more than 3 stages;

1: With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in hexanes T=-20°C; 0.333333 h; 2: methyl 4-(trifluoromethyl)phenyl ether in tetrahydrofuran; hexanes T=-20°C; 0.25 h; 3: N-Methoxy-N-methyl-benzamide in tetrahydrofuran; hexanes T=-20°C; 0.166667 h;

(i) Mg, I2, (ii) /BRN= 2841664/, (iii) aq. H2SO4; Multistep reaction;

pyridine hydrochloride T=200°C; 3 h;