1: 1-bromo-4-methoxy-benzene With magnesium in tetrahydrofuran Metallation; 2: 2,3-dichloro-prop-1-ene With CuMe2*SMe2 in tetrahydrofuran T=0°C; Grignard reaction; 1 h;

iron(II) sulfate in water; dimethyl sulfoxide 0.166667 h;

2,3-dichloro-prop-1-ene; magnesium 1.) THF, 2.) THF, rt., 2 h; Yield given. Multistep reaction;