1: With gallium(III) chloride in 1,2-dichloro-benzene T=90°C; 1 h; 2: With ethylenediamine in 1,2-dichloro-benzene T=100°C; 0.5 h; Further stages.;

1: With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.5 h; Inert atmosphere; 2: With N-chloro-succinimide in tetrahydrofuran; hexane T=0 - 20°C; Inert atmosphere;

lithium in tetrahydrofuran

n-butyllithium; gallium(II) chloride in chlorobenzene T=80°C; 3 h;