General procedure H for the HWE reaction to obtain vinyl sulfones. Diethyl ((phenylsulfonyl)methyl)phosphonate (0.5 mmol, 1 equiv.) was dissolved in THF (dry, 5 mL) under an argon atmosphere. The solution was cooled to -78 °C, and a 1 M solution of lithium bis(trimethylsilyl)amide (0.6 mmol, 1.2 equiv.) in THF was added dropwise. The mixture was stirred for an additional 30 min at the same temperature before the aldehyde (0.5 mmol, 1 equiv.) was added. The reaction temperature was kept at -78 °C for 2 h before it was slowly heated up to 0 °C. Water (15 mL) was added, and the phases were separated. The aq. layer was extracted with EtOAc (3 × 15 mL). The organic layers were combined and washed with sat. NH4Cl solution (2 × 15 mL), sat. NaHCO3 solution (2 × 15 mL), and brine (1 × 15 mL). The solvent was removed under reduced pressure after drying over Na2SO4. The resulting crude product was purified by flash column chromatography to afford the vinyl sulfone. The compounds were isolated as a mixture of E/Z isomers, resulting in NMR spectra of high complexity.