Potassium ions, vanadium phosphates

L-xy/o-Hexulosonic acid has been prepared via oxidation of 3,4 5,6-di-0-iso-propylidene-L-sorbose and the racemic derivative (296) was produced on thermolysis of the ozonide (27) (see Chapter 3). 3-Deoxy-D-uw6i/io-[l- C]heptulosonic acid 7-phosphate has been synthesized by addition of potassium [ C]cyanide to 2-deoxy-D-ara6i o-hexose 6-phosphate, hydrolysis, and selective oxidation of the resulting 3-deoxyheptonic acid 7-phosphates at C-2 with potassium chlorate-vanadium(v) oxide. A one-step synthesis of a mixture of 3-deoxy-D-r/6o- and -D-araWno-heptulosonic acid 7-phosphates is based on a metal-ion-catalysed reaction of o-erythrose 4-phosphate with oxalacetate. ... 

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