Experiments reported in Part III1 of this series have resulted in the elucidation of the structure and configuration of a monotoluenesulfonyl anhy-drohexitol2 which has been shown to represent the 1-p-toluenesulfonyl2,5-anhydro-L-iditol (I). However, we have been unable to prepare the 2,5anhydro-L-iditol from this derivative by hydrolysis, or from the 1,6-diiodo derivative in the usual manner.
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