p-Toluenesulphonic acid-promoted, I₂-catalysed sulphenylation of pyrazolones with aryl sulphonyl hydrazides

Abstract

Aryl pyrazolone thioethers were synthesized via the I2-catalysed cross-coupling of pyrazolones with aryl sulphonyl hydrazides in the presence of p-toluenesulphonic acid, which has been proposed to promote the reaction by facilitating the decomposition of sulphonyl hydrazides.