hydrogenchloride; tetrafluoroboric acid; sodium nitrite Erhitzen des Reaktionsprodukts auf 295grad;

1: 3-fluoro-1,2,5-tribromobenzene With isopropylmagnesium chloride in tetrahydrofuran T=-40°C; Grignard reaction; 2 h; 2: carbon dioxide in tetrahydrofuran T=-40°C; 1 h; Further stages. Title compound not separated from byproducts.;