1: 1-iodo-n-hexane With chloro-trimethyl-silane; ethylene dibromide; lithium chloride; zinc in tetrahydrofuran T=50°C; 24 h; 2: carbon dioxide With bis(acetylacetonate)nickel(II); tri-cyclo-hexyl-phosphine in tetrahydrofuran; toluene T=20°C; P=760.051 Torr; 3 h; 3: With hydrogenchloride; water in tetrahydrofuran; toluene