Water → 4-{[(4-Chlorobenzene-1-sulfonyl)imino]methyl}benzoic acid

Participants

Reaction Steps

A well-stirred slurry consisting of 4.64g (31 mmol) of 4-carboxybenzaldehyde and 5.92 g (31 mmol) of 4-chlorobenzenesulfonamide and 20 mg of p-toluenesulfonic acid (TsOH) in 130 mL of toluene was heated to reflux for a total of 5 hours. The water formed from the reaction was removed by a Soxhlet extractor packed with 3A molecular sieves as described above. The mixture was allowed to cool to room temperature and was filtered to provide 9.76 g (98%) of SULF-1 as a white powder: mp >245° C.; IR (Nujol) 3300-2300 (br), 3090, 1689, 1616, 1168, 1013 cm-1 ; 1H NMR (DSMO-d6, TMS ext standard, 60 MHz) δ9.15 (s, 1), 8.01 (s, 4), 7.79 (AB, 4, JAB =11, Δν=16).

Provenance & Evidence