Studies on Orchidaceae Glycosides. 5. The Absolute Configuration of (+)-erythro-Isobutyltartaric Acid, a Component of the Glucoside Loroglossine.

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Abstract
(+)-erythro-Isobutyltartaric acid, a component of the glucoside loroglossine, was shown to have the 2R, 3S configuration. Syntheses of the 2S, 3R and 2R, 3R isomers of isobutylerythritol and dimethyl (2S, 3S)-isobutyltartrate from 2,3-O-isopropylidene-D-glyceraldehyde are described. The circular dichroism curves of the molybdate complexes of the 2R, 3S and the 2S, 3S isomers of isobutyltartaric acid are discussed.