The aromatic sulfuric acid esters are found in normal and especially in pathological urine. Since the discovery of pheno-sulfatase, which splits the aromatic sulfuric acid esters, the preparation of the esters has become significant.'The procedure generally used and improved by Neuberg and collaborators* is that according to Czapek. Analogous to this method chlorosulfonic acid is added to an ice-cooled solution of pyridine in chloroform ...
