cesium fluoride; potassium iodide in N,N,N',N',N'',N''-hexamethylphosphoric triamide 25 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

formic acid in water 16 h; Heating;

1: acetone 2: 4.1 percent Chromat. / KI / hexamethylphosphoric acid triamide / 25 h / Ambient temperature View Scheme