potassium tert-butylate in tert-butyl alcohol T=25°C; 24 h; Inert atmosphere;

PhSi(Me)2CH2MgCl; 1,3-bis(2,4,6-trimethylphenyl)imidazolinium chloride; cobalt(II) chloride in tetrahydrofuran; 1,4-dioxane T=25°C; 1 h; Inert atmosphere; regioselective reaction;