1: 6-Iodo-hexanoic acid ethyl ester With chloro-trimethyl-silane; zinc; 1,1-dibromomethane in tetrahydrofuran T=20 - 60°C; 16 h; 2: With lithium chloride in tetrahydrofuran T=0°C; 0.166667 h; 3: 4-methoxy-benzoyl chloride in tetrahydrofuran T=0°C; 3 h; Further stages.;

sodium hydroxide in tetrahydrofuran; methanol 2 h;