In a previous paper2 it was shown that «/-xylal by means of ozone could be degraded to a tetrose, which was identified as «/-threose. Ozone apparently had a dualistic action. Firstly, it was added to the double bond, forming an unstable ozonide, which in turn was broken down under the influence of the solvent, acetic acid, to two aldehyde groups. Secondly, cleavage of the 1,5oxygen ring took place, a fact which had to be assumed since a free tetrose and not its 4-formyl derivative was found as the reaction product.In this present communication we report a further investigation of the reaction, using /arabinal, III, as a starting material. It could be
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