1: 4-(Propyl-2-ene)butyric acid With N,N'-dimethyl-N,N'-propyleneurea; n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=20°C; 1 h; 2: 6-iodohexene in tetrahydrofuran; hexane T=20°C; 2 h;