Supported sorbitol oxidation

Supported gold nanoparticles have been used in sorbitol oxidation and compared with analogous Pd and Pt catalysts [41]. The catalytic data for the monometallic catalysts are reported in Table 13.8. Using carbon as a support, the reaction took... 

A fraction of the sirupy diketal was obtained in crystalline form (m. p. 55-56°). This material consumed one mole of periodate (or lead tetraacetate), with the liberation of 0.86 mole of formaldehyde, which fact eliminated all but the 1,2,3,4- and 3,4,5,6-isomers.144 Hydrolysis of the diisopropylidene-ofde/ij/do-pentose formed during the oxidation yielded D-arabinose and so the diisopropylidene-D-sorbitol must have been one of the three members of the latter group. That it was in fact the 3,4 5,6-compound was demonstrated by its partial hydrolysis to 3,4-isopropyli-dene-D-sorbitol.144 Consequently the triketal from which both had been derived must have been l,2 3,4 5,6-triisopropylidene-D-sorbitol. This being so, the sirupy diketal mentioned above should have contained some of the 1,2 3,4- compound, a hypothesis which found support in the observation that periodate oxidation of the sirup and subsequent hydrolysis of the products afforded a mixture of D-arabinose and L-xylose (identified by filter paper chromatography).144... 

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