Abstract
Mannan B and cellulose were oxidized with nitrogen tetroxide to transform the C-6 hydroxyls into carboxyl groups. In both products keto groups had formed on secondary carbons in side-reactions. After reduction of the oxidized polysaccharides with sodium borohydride- t 4, determination of the radioactivity indicated that the ratio of keto groups in oxycellulose to those in oxymannan was 2:1. Comparison of the count of radioactivity with that of diphenylmethanol- t 2 prepared from a similarly reduced sample of diphenyl ketone showed that the oxymannan contained one keto group for every 10 anhydro- d-mannose units.
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