iron (III) acetylacetonate in tetrahydrofuran T=-78°C;

aluminium trichloride 0 deg C, 1 h then 80 deg C, 2 h;

carbon disulfide; aluminium trichloride T=0°C;

potassium hydroxide; hydrazine hydrate in diethylene glycol 130 deg C, 2 h then 200 deg C, 2 h;

1: 58 percent / hydrazine hydrate, potassium hydroxide / bis-(2-hydroxy-ethyl) ether / 130 deg C, 2 h then 200 deg C, 2 h 2: 1.) butyl-lithium; 2.) tri-isopropyl borate; 3.) aq. sodium carbonate / 3.) tetrakis(triphenylphosphine)palladium(o) / 1.) THF/hexane, -78 deg C, 2.5 h; 2.) THF/hexane, rt.; 3.) ethanol/benzene, 23 h, reflux View Scheme