cesium fluoride in N,N,N',N',N'',N''-hexamethylphosphoric triamide 5 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

cesium fluoride in N,N,N',N',N'',N''-hexamethylphosphoric triamide 24 h; Ambient temperature; Yield given. Yields of byproduct given;