iodine in dichloromethane T=20°C; 18 h;

1: 2-(1,3-dioxolan-2-yl)ethylMgBr With ferrous acetate; 1,3-bis(2,4,6-trimethylphenyl)imidazolinium chloride in tetrahydrofuran T=50 - 60°C; Kumada Cross-Coupling; 0.333333 h; Schlenk techniqueInert atmosphere; 2: ethyl iodide in tetrahydrofuran T=20°C; Kumada Cross-Coupling; 8 h; Schlenk techniqueInert atmosphere;

T=30°C; 6 h; Irradiation;

toluene-4-sulfonic acid in benzene Heating;