Vijaya Kumar, T.; Rama Koteswara Rao, C.; Mukkanti, K.; S. Mainkar, P. Polyethylene Glycol (PEG-400) As an Efficient and Recyclable Reaction Medium for One-Pot Synthesis of Substituted Pyrroles Under Catalyst-Free Conditions. ajc 2015, 27, 1457-1461.