In this case the nucleophile is a sodium alkylsulfinate, and there will be tetrabutylammonium iodide as the catalyst. No yield was given in this patent. "A mixture of diisopropyl (bromomethyl)phosphonate (0.5 g, 1.93 mmol), sodium cyclopropanesulfinate (0.37 g, 2.895 mmol) and TBAI (0.071 g, 0.19 mmol) in DMF (4 mL) was heated overnight in a IOO0C oil bath. The mixture was cooled to it and diluted with EtOAc and water. The layers were separated, and the organic layer was washed with saturated NaHC03, brine, dried (Na2S04) and filtered. The solvent was removed and the crude was purified by silica gel to obtain the title compound."