Since the Newman-Kwart rearrangement occurs almost withoutby-products in high yields, the reaction is one of the most important methods for the preparation of aryl-sulphur compounds. One major advantage is the possibility of performing the reactions in substance without any solvent. A recent publi-cation by a development group at Pfizer described a procedurefor carrying out a continuous Newman-Kwart rearrangement reaction. This method provides a convenient, economical approach to the thiocarbamate rearrangement products and their thiol derivatives.