1: With lithium diisopropyl amide in tetrahydrofuran; hexane T=-85 - -75°C; 1.41667 h; 2: With iodine in tetrahydrofuran; hexane T=-78°C; 4 h; Further stages.;

1: With 2,2,6,6-tetramethyl-piperidine; n-butyllithium; C6H16N2*2Cl(1-)*Zn(2+) in tetrahydrofuran T=20°C; 2 h; Inert atmosphere; 2: With iodine in tetrahydrofuran Inert atmosphere; regioselective reaction;

in tetrahydrofuran treatment with I2 in THF at room temp.;