Patent ID: 7619120

Claim:
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 1 and R 2 are each independently a halogen, an alkyl having 1 to 8 carbons or an alkenyl having 2 to 8 carbons; m and n are each independently 0 or an integer of 1 to 4; and R 3 is an alkyl having 1 to 8 carbons, an alkenyl having 2 to 8 carbons, a cycloalkyl having 3 to 8 carbons or an optionally substituted aralkyl, comprising reacting a compound of Formula (II) wherein R 1 , R 2 , m and n are as defined above with a compound of Formula (III) R 3 —X (III) wherein R 3 is as defined above and X is a halogen 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.