Invention relates to a impurity free preparation process of 4-fluoro-.alpha.-[2-methyl-1-oxopropyl]-y-oxo-n-beta-diphenylbenzenebutanamide, a key intermediate for the synthesis of Atorvastatin. Atorvastatin a drug useful for lowering blood cholesterol, stabilizing plaque and preventing stroke through anti-inflamatory and other mechanisms.
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