Patent ID: 7619120
Filing Date: 2009-11-17
Classification: C07C

Abstract:
1. A process for the preparation of a non-colored compound of Formula (I), which has a b value of 2.5 or less when measured by a color difference meter, wherein R reacting a compound of Formula (II) wherein R with a compound of Formula (III) wherein R in a solvent in the presence of a base; extracting the compound of Formula (I) at a pH of between about 8.0 and about 9.0 with an organic solvent, wherein the concentration of the compound of Formula (III) in the organic solvent is 5% by weight or less; and purifying by adding water or pH adjusted water to achieve a pH of between about 8.3 and about 8.6; wherein the compound of Formula (I) is obtained in an amount of at least about 63 grams.