in tetrahydrofuran 24 h; Heating;

potassium hydroxide; bis(o-nitrophenyl)phenylphosphonate; tetra(n-butyl)ammonium hydrogensulfate; potassium carbonate 1.) water/dichloromethane, 30 min, 2.) dichloromethane, RT, overnight; Yield given. Multistep reaction;

potassium hydroxide; bis(o-nitrophenyl)phenylphosphonate; tetra(n-butyl)ammonium hydrogensulfate; potassium carbonate other acids; multistep reaction;