potassium hydroxide; hydrazine in diethylene glycol T=180 - 210°C; 3 h;

1: thiophene With n-butyllithium in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide T=-78°C; 0.333333 h; Inert atmosphere; 2: 2-methyl-1-bromopropane in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide T=20°C; 2 h;

1: thiophene With n-butyllithium in tetrahydrofuran; hexane T=-40°C; 2 h; 2: iso-butyl iodide in tetrahydrofuran; hexane T=0 - 20°C; Further stages.;

trichlorophosphate anschliessendes Behandeln mit wss. Natriumcarbonat-Loesung;

1: 70 percent / SnCl4 / benzene 2: 75 percent / BF3*OEt2 / CHCl3 3: W6 Raney nickel / ethanol View Scheme