tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 1.5 h; Ambient temperature; Yield given. Title compound not separated from byproducts;

1: 39 percent / oxygen, hexamethylphosphoric triamide, copper(I) chloride / bis(acetonitrile)dichloropalladium(II) / 1,2-dimethoxy-ethane / 24 h / 50 °C 2: 62 percent / Amberlyst-15, water / acetone / 24 h / Ambient temperature 3: 85 percent / K2CO3 / acetone / 24 h / Ambient temperature View Scheme