Patent ID: 7989635
Filing Date: 2011-08-02
Classification: C07D

Abstract:
1. A method for producing a purified particulate solid (II) of a salt represented by formula (1), which comprises: suspending a particulate solid (I) of a salt in a solvent comprising an etheric oxygen atom-containing compound, separating the solvent by filtration, and recovering particulate solid (II) of said salt; wherein particulate solids (I) and (II) of a salt are represented by the formula: wherein each of R's which may be the same or different, is a hydrogen atom or a C wherein particulate solid (I) has a purity ranging from 80 mol. % to 99 mol. % as measured by NMR (nuclear magnetic resonance); and wherein particular solid (II) has a purity of 90 mol. % or higher as measured by NMR (nuclear magnetic resonance), and wherein the purity of particular solid (II) is higher than the purity of particular solid (I).