iodine in dichloromethane T=20°C;

1: n-C5H112-X With n-butyllithium in tetrahydrofuran; hexane T=20°C; 2: With zinc dibromide in tetrahydrofuran; hexane T=-50 - 20°C; 3: (2E,4Z)-5-bromopenta-2,4-dienal With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=20°C;

1: n-C5H112-X With n-butyllithium in tetrahydrofuran; hexane T=20°C; 2: With zinc dibromide in tetrahydrofuran; hexane T=-50 - 20°C; 3: (2E,4Z)-5-bromopenta-2,4-dienal With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=20°C;