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degradation$19662$ - translation to greek
![Pulp at a [[paper mill]] near Pensacola, 1947](https://commons.wikimedia.org/wiki/Special:FilePath/Florida Pulp and Paper Company mill, Cantonment, Florida.jpg?width=200 "Pulp at a [[paper mill]] near Pensacola, 1947")
![absorbent]] products with the [[Kraft process]]](https://commons.wikimedia.org/wiki/Special:FilePath/InternationalPaper6413.jpg?width=200 "absorbent]] products with the [[Kraft process]]")
Definition
Wikipedia
The Wohl degradation in carbohydrate chemistry is a chain contraction method for aldoses. The classic example is the conversion of glucose to arabinose as shown below. The reaction is named after the German chemist Alfred Wohl (1863–1939).
In one modification, d-glucose is converted to the glucose oxime by reaction with hydroxylamine and sodium methoxide. In the second step the pentaacetyl glycononitrile is formed by reaction with acetic anhydride in acetic acid with sodium acetate. In this reaction step the oxime is converted into the nitrile with simultaneous conversion of all the alcohol groups to acetate groups.
In the final step sodium methoxide in methanol is added, leading to removal of all the acetate groups and ejection of the nitrile group and collapse of the second carbon from a tetrahedral structure to an aldehyde.
