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4-Nitrobenzenesulphonamide (2.02 g, 10 mmol) was added to a solution of 1,3,5-trioxane (1.96 g, 20 mmol) in acetic acid (5 ml). The mixture was stirred for 5 minutes and methanesulphonic acid (10 ml) was added slowly. The mixture was then stirred at 35° C. for 20 minutes, cooled to 0° C., diluted with water and extracted with ethyl acetate. The combined extracts were washed twice with water and twice with 5% aqueous sodium hydrogen carbonate solution, and then dried and the volatiles removed by evaporation. The residue was recrystallized from ethanol to give the title compound (955 mg, 35% yield). NMR: 4.87 (s, 2H), 5.30 (s, 4H), 8.20 (d, 2H), 8.42 (d, 2H).

1. stirringThe mixture was then stirred at 35° C. for 20 minutes
2. extractionextracted with ethyl acetate
3. washThe combined extracts were washed twice with water and twice with 5% aqueous sodium hydrogen carbonate solution
4. customdried
5. customthe volatiles removed by evaporation
6. customThe residue was recrystallized from ethanol