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ball mill feed opening 1

The mechanochemical technique of ball milling has been applied to the asymmetric opening of meso-anhydrides, mediated by the cinchona alkaloid quinidine. A simple workup procedure affords the products, optically active dicarboxylic acid monoesters, in high yields, with up to 64 ee. With most substrates no column chromatography was needed. A range of various alcohols, as well as