Abstract
Autoxidative processes in HCl may be influenced by reactions of the organic peroxy intermediates, or of H2O2, with the medium. These reactions with HCl led to the evolution of O2 and also of Cl2 under certain conditions. The question whether HCl is oxidized by an organic peroxy intermediate or by H2O2 could be answered.Organic compounds may be chlorinated by H2O2‐HCl in high yields. The experiments strongly support the idea that aromatic chlorination is then effected by the species HOCl and/or HOOCl which are produced in situ.