2,3-Dihydroxybutanedioic Acid → (R)-2-(3-(Diisopropylamino)-1-phenylpropyl)-4-methylphenol 2,3-dihydroxysuccinate

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In accordance with the present invention, a process is provided for preparation of tolterodine tartrate form I. Thus, tolterodine free base is dissolved in a suitable solvent, tartaric acid is added to the solution and tolterodine tartrate form I is isolated. The suitable solvents are ethanol, methylene dichloride, chloroform, acetone, acetonitrile and 1,4-dioxane; and a mixture thereof. The preferable solvents are ethanol and acetone.

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