Yk. Zhao et al., H-1 NMR and X-ray crystallographic studies of p-toluenesulfonamides of 2,5-di(pyrrol-2-yl) pyrrolidines, J CHEM R-S, (5), 1999, pp. 312-313
Some pyrrole-N-substituted derivatives of cis-1-(4-methylphenylsulfonyl)-2,
5-di(pyrrol-2-yl)pyrrolidine are prepared, subjected to Vilsmeier formylati
on and bromination conditions, and products characterised by NMR and in two
cases X-ray analysis.