1: benzo[b]thiophene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.25 h; 2: 1,4-cyclohexanedione monoacetal in tetrahydrofuran; hexane T=-78 - 20°C; 0.166667 h; 3: With water in tetrahydrofuran; hexane