Patent ID: 6852890
Filing Date: 2005-02-08
Classification: C07C

Abstract:
1. A process for the preparation of a phenylhydrazine or an inorganic acid salt thereof of the formula (1): wherein X is a hydrogen atom or a halogen atom; Y is a halogen atom; and W is a hydrogen atom or —ZR in which Z is an oxygen atom or a sulfur atom, and R is a hydrogen atom, a C said method consisting essentially of the step of hydrolyzing a phenylhydrazine derivative of the formula (2): in the presence of water and an inorganic acid, wherein the concentration of the inorganic acid is at least 6 moles per 1 kg of water in a reaction system; wherein X, Y and W of formula (2) are the same as defined in formula (1), and the Q groups are the same or different from each other and represent a hydrogen atom, an ammonium group or an alkali metal atom.