C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 209/88 (2006.01) C07D 209/96 (2006.01)
Patent
CA 2274355
A process of purifying a (6-chloro-2-carbazolyl)methyl-malonic acid di(C1 -C6 alkyl) ester of Formula (I): <see formula I> wherein R a and R b must be the same and are selected from the group consisting of C1 -C6 alkyl; comprises phase separating one or more impurities from said carbazole ester at least once wherein the solvent used to carry out said phase separation is acetic acid. In a preferred embodiment said acetic acid is glacial acetic acid which is maintained at a temperature of from about 30° to about 110° C and said carbazole ester is obtained in a purity of at least 99.90% by weight, so that the amount of impurities present therein is 0.10% or less by weight. In a more preferred embodiment of said process, said temperature is from about 50° to about 70° C, and said phase separation is carried out only once.
Devries Keith Michael
Hammen Philip Dietrich
Rescek Diane Marie
Rose Peter Robert
Tucker John Lloyd
Pfizer Products Inc.
Smart & Biggar
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