PROCESS FOR THE PREPARATION OF POLYMORPHS OF MESOTRIONE AND PH ADJUSTING

摘要

A process for selectively controlling the crystallisation of thermodynamically stable Form (1) or kinetically stable Form (2) polymorphs of mesotrione from an aqueous mesotrione solution, said method comprising adjusting the pH of the mesotrione solutions to a value wherein said thermodynamically stable Form (1) or kinetically stable Form (2) mesotrione is ultimately obtained is disclosed.