1: 1-Ethenyl-3-(phenylmethoxy)benzene With (C5H3N)(MeC=N(C6H4-2,6-iPr2))2; ethylmagnesium bromide; iron(II) chloride in tetrahydrofuran; diethyl ether T=20°C; 2 h; Inert atmosphere; 2: carbon dioxide in tetrahydrofuran; diethyl ether 0.5 h; Inert atmosphere; regioselective reaction;

1.1: potassium carbonate / 1,4-dioxane / 16 h / Reflux 2.1: (C5H3N)(MeC=N(C6H4-2,6-iPr2))2; ethylmagnesium bromide; iron(II) chloride / tetrahydrofuran; diethyl ether / 2 h / 20 °C / Inert atmosphere 2.2: 0.5 h / Inert atmosphere View Scheme