Sodium -Arsenyl Tartrate

Sodium (+)-arsenyl tartrate, a useful resolving agent,1 is not commercially available. It has been made by the reaction of arsenic(III) oxide with sodium hydrogen (+)-tartrate.2 The following synthesis is an adaptation of this method. 

Racemic acetylacetonatobis(ethylenediamine)cobalt(III) ion was first prepared by Werner and Matissen from the hydroxoaquo complex. Later Werner, Schwyzer, and Kar-rer prepared the optical antipodes from the resolved chloro-aquobis(ethylenediamine)cobalt(III) cation. The present method describes an efficient preparation and a simple resolution of the racemic salt using sodium (-l-)-arsenyl tartrate as the resolving agent. 

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